New Phone? Fix MySainsburys Authenticator (Update 2026)

Switching to a new phone can cause authentication problems when logging into MySainsburys. If your Microsoft Authenticator app isn’t working after changing devices, don’t worry — most issues can be resolved quickly.

Why the Authenticator Stops Working on a New Phone

Common reasons include:

MFA is still linked to your old device.
Authenticator app hasn’t been set up on the new phone.
Time or date settings are incorrect on the new device.
Backup codes weren’t saved or available.
Network or notification issues prevent authentication prompts.

Understanding the cause helps you choose the right fix.

Step-by-Step Fix for a New Phone

Step 1: Use a Backup Verification Method

If your Authenticator isn’t working, try SMS verification or a backup email if you registered one.
Microsoft allows alternate methods to approve logins temporarily.

Step 2: Install Authenticator on the New Phone

Download the Microsoft Authenticator app from your device’s app store.
Open the app and choose Add account → Work or school account.
Follow instructions to scan a QR code or enter the setup code provided during login.

Step 3: Sync Your Device Time

Open your phone Settings → Date & Time.
Enable Automatic Date & Time.
Incorrect time can prevent verification codes from working.

Step 4: Remove Old Device from Account

Log into your MySainsburys account from a computer if possible.
Go to Security settings → Devices / MFA.
Remove the old phone from your account to avoid repeated MFA prompts there.

Step 5: Complete Multi-Factor Authentication

Open the Authenticator app on your new phone.
Approve the login request.
If the request does not appear, check notifications and open the app manually.

What to Do if It Still Doesn’t Work

Retry using a different verification method (backup email or phone).
Clear your browser cache or try another browser.
Contact IT support or HR for an MFA reset. They can unlink your old device and link the new one safely.

Tips for Future Device Changes

Always save backup codes in a secure place.
Keep your recovery phone number and email updated.
Update your Authenticator app on new devices before logging out of the old phone if possible.
Use the official portal oursainsburys.co.uk to avoid fake login pages.

You can also read: MySainsburys Authenticator Not Working Fix (Update 2026)

Common Problems Table

Problem	Cause	Solution
Authenticator app not sending requests	Old device still linked	Remove old device or request MFA reset
Verification code rejected	Time mismatch	Enable automatic date & time
Login blocked	Multiple failed attempts	Wait or reset password
No backup codes	Device lost	Contact IT support
Notifications not showing	App settings or network	Enable notifications, open app manually

FAQs

Yes, using backup verification like SMS or email, or with IT support assistance.

Contact IT or HR to reset MFA and register your new device.

Usually a few minutes once you have the setup code and QR scan ready.

Not if it has been removed from your account. Otherwise, approvals will still go there.

Yes, but MFA verification is required on each device for security.

Final Words

Changing your phone doesn’t have to lock you out of MySainsburys. By following these steps — using backup verification, setting up Microsoft Authenticator on the new device, syncing your time, and removing old devices — you can regain access quickly and securely.
Always keep backup codes, update recovery options, and use official login links to avoid delays or security issues.

New Phone? Fix MySainsburys Authenticator (Update 2026)

Why the Authenticator Stops Working on a New Phone