Hello Tom grasso,
Thanks for your question
You need to contact support and mention that your admin account was compromised and you need urgent recovery. You can use the global support numbers here:
Once it is resolved, I would recommend you reset the users password and attend to the compromised accounts.
See:
https://learn.microsoft.com/en-us/entra/id-protection/howto-identity-protection-remediate-unblock
https://learn.microsoft.com/en-us/defender-office-365/responding-to-a-compromised-email-account
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola