A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
Hello Caroline,
I would contact your IT Admin/point of contact in your company who manages your Microsoft 365 or email accounts.
Your admin will need to log into the Microsoft Entra admin center and check your authentication settings. They can then investigate this, and the audit logs to check what activity has been on the account. There could be a simple explanation, but its best for them to check this as soon as possible.
I hope this gets sorted quickly for you.
Jim