Microsoft 365 Migration Guide

Your devices:

⚠️ Before Migration — Do by Wed 13 May

Remove your work account from the Microsoft Authenticator app on your phone. This must be done before the migration on Thursday.

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Open the Microsoft Authenticator app

Find and open Microsoft Authenticator on your Android phone.

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🔐

Authenticator⋯

🏢
Your Company
yourname@company.com
›
👤
Personal
you@gmail.com
›

Tap on your company account

Tap the account showing your work email (e.g. yourname@company.com).

Only remove your work/company account. Do NOT remove personal accounts.

Tap the gear icon ⚙️ → "Remove account"

Tap ⚙️ in the top-right, then tap "Remove account".

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‹Account Details⚙️

Sign in with this account
Remove account
← TAP

Confirm removal

Tap "Continue" or "Remove" to confirm.

After the migration you'll set up MFA again when you first sign in.

Open the Microsoft Authenticator app

Find and open Microsoft Authenticator on your iPhone.

9:41

🔐

Authenticator⋯

🏢
Your Company
yourname@company.com
›
👤
Personal
you@icloud.com
›

Tap on your company account

Tap the account showing your work email.

Only remove your work/company account. Do NOT remove personal accounts.

Tap ⚙️ → "Remove account"

Tap ⚙️ in the top-right. Scroll down and tap "Remove account".

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‹Account Details⚙️

Sign in with this account
Enable app lock
Remove account
← TAP

Confirm removal

Tap "Continue" or "Remove" to confirm.

After the migration you'll set up MFA again when you first sign in.

Phase 1 complete! 🎉

Your old MFA has been removed. Come back after the migration on Thursday to complete Phase 2 below.

✅ After Migration — From Thu 14 May

Reconnect your computer and phone apps to the new tenant. Only do this after IT confirms the migration is complete.

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Disconnect old work account

Press Win + i on your keyboard to open Settings. Then go to Accounts → Access work or school. Click your company account, then "Disconnect".

Settings

─☐✕

System

Accounts

Work or school

Access work or school

Connect to your organisation's resources

🏢
yourname@company.com
Connected to Company's Azure AD
Disconnect

Reconnect with your account

Click "+ Connect", sign in with your email. You'll be directed to the new tenant. Set up MFA when prompted.

Sign out and back into Office apps

Sign out of all Microsoft apps, then sign back in. The steps differ depending on the app:

Excel, PowerPoint, Word: Click your profile icon (top-right corner) → "Sign out".

Outlook (New): Go to File → Settings → Accounts → Manage (your work email) → scroll down and click "Remove".

Outlook (Classic): Go to File → Office Account (bottom-left) → "Sign out".

Teams & OneDrive: Click your profile icon → "Sign out".

After signing out of each app, reopen it and sign back in with your same email address.

Not sure if you have Outlook New or Classic? If you see a toggle at the top that says "New Outlook", you're on the new version. If not, you're on Classic.

Re-register MFA on Authenticator

During sign-in you'll be prompted to set up MFA. Open Microsoft Authenticator on your phone and follow the instructions.

This is a fresh MFA registration with the new tenant.

Sign out of all Microsoft apps

Open each Microsoft app (Outlook, Teams, Word) → app menu → Sign Out.

Outlook — Account

‹Outlook›Account

🏢

yourname@company.comMicrosoft 365 (old tenant)

Sign Out
← CLICK

Clear Microsoft credentials from Keychain

Open Keychain Access (⌘ + Space, type "Keychain"). Search Microsoft and delete all Microsoft entries.

Skipping this may cause apps to use old cached credentials.

Sign back into Microsoft apps

Open Outlook, Teams, OneDrive. Sign in with your same email — you'll be directed to the new tenant.

Re-register MFA on Authenticator

During sign-in you'll be prompted to set up MFA. Open Microsoft Authenticator on your phone and follow the steps.

This is a fresh MFA registration with the new tenant.

Computer done! 💻

Now continue with the phone app steps below.

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Remove and re-add your account in Outlook

Open Outlook → profile icon → ⚙️ → under "General", tap "Accounts" → tap your work email → "Delete Account".

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‹Settings

General
Accounts
← TAP
Notifications
›

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‹yourname@company.com

Sync Calendar
Delete Account
← TAP

Then tap "Add Account" and sign in.

If this works, skip to step 4. If errors persist, continue to step 2.

If that didn't work: Clear Outlook cache

Go to Settings → Apps → Outlook → Storage → Clear Cache, then Clear Data. Open Outlook and sign in again.

Still not working? Uninstall and reinstall

Long-press Outlook → Uninstall. Reinstall from Google Play Store and sign in fresh.

Repeat for Microsoft Teams

First: Sign out → sign back in. If that fails: Clear cache/data. Last resort: Uninstall and reinstall.

Set up MFA on Authenticator

When prompted during sign-in, open Microsoft Authenticator and add your work account back.

You only need to set up MFA once — it applies to all Microsoft apps.

Remove and re-add your account in Outlook

Open Outlook → profile icon → ⚙️ → under "General", tap "Accounts" → tap your work email → "Delete Account".

9:41

‹Settings

General
Accounts
← TAP
Notifications
›

9:41

‹yourname@company.com

Sync Calendar
Delete Account
← TAP

Then tap "Add Account" and sign in.

If this works, skip to step 4. If errors persist, continue to step 2.

If that didn't work: Offload Outlook

Go to Settings → General → iPhone Storage → Outlook → "Offload App". Then tap "Reinstall App" and sign in.

Still not working? Delete and reinstall

Long-press Outlook → "Remove App" → "Delete App". Reinstall from App Store and sign in fresh.

Repeat for Microsoft Teams

First: Sign out → sign back in. If that fails: Offload app. Last resort: Delete and reinstall.

Set up MFA on Authenticator

When prompted during sign-in, open Microsoft Authenticator and add your work account back.

You only need to set up MFA once — it applies to all Microsoft apps.

All done! 🎉

Your migration is complete. All devices are connected to the new tenant. If you have any issues, contact IT support.

Microsoft 365
Tenant Migration Guide

Open the Microsoft Authenticator app

Tap on your company account

Tap the gear icon ⚙️ → "Remove account"

Confirm removal

Open the Microsoft Authenticator app

Tap on your company account

Tap ⚙️ → "Remove account"

Confirm removal

Phase 1 complete! 🎉

Disconnect old work account

Reconnect with your account

Sign out and back into Office apps

Re-register MFA on Authenticator

Sign out of all Microsoft apps

Clear Microsoft credentials from Keychain

Sign back into Microsoft apps

Re-register MFA on Authenticator

Computer done! 💻

Remove and re-add your account in Outlook

If that didn't work: Clear Outlook cache

Still not working? Uninstall and reinstall

Repeat for Microsoft Teams

Set up MFA on Authenticator

Remove and re-add your account in Outlook

If that didn't work: Offload Outlook

Still not working? Delete and reinstall

Repeat for Microsoft Teams

Set up MFA on Authenticator

All done! 🎉

Need Help?

Microsoft 365Tenant Migration Guide

Open the Microsoft Authenticator app

Tap on your company account

Tap the gear icon ⚙️ → "Remove account"

Confirm removal

Open the Microsoft Authenticator app

Tap on your company account

Tap ⚙️ → "Remove account"

Confirm removal

Phase 1 complete! 🎉

Disconnect old work account

Reconnect with your account

Sign out and back into Office apps

Re-register MFA on Authenticator

Sign out of all Microsoft apps

Clear Microsoft credentials from Keychain

Sign back into Microsoft apps

Re-register MFA on Authenticator

Computer done! 💻

Remove and re-add your account in Outlook

If that didn't work: Clear Outlook cache

Still not working? Uninstall and reinstall

Repeat for Microsoft Teams

Set up MFA on Authenticator

Remove and re-add your account in Outlook

If that didn't work: Offload Outlook

Still not working? Delete and reinstall

Repeat for Microsoft Teams

Set up MFA on Authenticator

All done! 🎉

Need Help?

Microsoft 365
Tenant Migration Guide