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Hi Abbie Haynes,
Thanks for reaching out to Microsoft Q&A.
Please follow below steps :
- Make sure you have the latest version of the Microsoft Authenticator app installed as older versions might not support all features. To get the latest version, please check Download Microsoft Authenticator - Microsoft Support
- If you're using VPN, try disconnecting to see if the issue persists. Please try to switch to another stable network as well.
- Alternate Sign-in Method: If the Authenticator app is not working, try using another sign-in method, such as receiving a code via text message or email, if available.
- if you are end user or if you are admin but other user has admin rights, it is suggested to contact your admin and ask admin to re-register the Authentication method for your account. Admin can do it by follow Manage user authentication options. (If you are not sure who is your admin, can refer this How do I find my Microsoft 365 admin? - Microsoft Support).
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.