Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Amy,
Thank you for reaching out.
Granular admin relationships or delegated admin permissions normally give partners access to their customers' workloads. Obtain granular admin permissions to manage a customer's service - Partner Center | Microsoft Learn
If you don't recognize this company and have no record of giving them management roles, I'd strongly recommend you reach out to our tech support team to check this out. Since you can't log into the admin center, you can reach out via phone using phone numbers listed in this document Find Microsoft 365 for business support phone numbers by country or region - Microsoft 365 admin | Microsoft Learn depending on your country or region.
->You can also refer to phone numbers in Global Customer Service phone numbers - Microsoft Support
Alternatively, you can as well reach out to our partner community team. I'd strongly recommend posting via Microsoft Partner Center - Microsoft Q&A, so that a support agent from this team can check and provide you required information.
Thank you for your precious time and have a great day.
Best Regards,
Ashraf.