Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi @Mercer Thea
Based on my research, please try to connect the support by phone. Find the support number for your region in the official directory of Customer Service phone numbers - Microsoft Support.
Or please follow this link to create a trial tenant: https://www.microsoft.com/en-us/microsoft-365/business/microsoft-365-business-basic?msockid=3eb6980b5c6860e63a588d0c5d1761d6 - after that you will be able to access to Microsoft 365 Admin Center to raise the ticket
Assuming that you have already created an account after registering a free trial and you can go to Microsoft 365 admin center and click "Help & support" icon to raise your ticket.
Please mention that you are raising ticket on behalf of the affected tenant that you do not have access to.
Note: This process will take more time than usual (7-14 working days). As I am a user, I do not have access to Microsoft internal system to assist or push this process to be quicker.
On the other hand, if you do create the trial and it resolves the issue, please remember to cancel the subscription afterward to avoid any related charges.
I hope my information is helpful. Please give me any updates once you get this resolved.