Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Based on the information you provided, I understand that you signed up for a 30-day Microsoft 365 Business Standard trial. The subscription was then automatically converted to a paid subscription and the payment was processed successfully. However, when you try to open the Microsoft 365 admin centre, you receive a message stating that your account does not have permission to view or manage it.
First, please make sure that you are signing in with the original administrator account created during the Microsoft 365 Business Standard trial registration, rather than another account using your custom domain.
When a Microsoft 365 business trial is created, a billing account is also created. Microsoft states that the trial normally converts to a paid subscription at the end of the trial period unless recurring billing is turned off.
Please refer: https://learn.microsoft.com/en-us/microsoft-365/commerce/try-or-buy-microsoft-365?view=o365-worldwide
Please try the following:
- Sign out of all Microsoft accounts in your browser.
- Open a private or InPrivate browser window.
- Sign in to the Microsoft 365 admin centre using the original account created during the trial registration.
- If an account ending in
onmicrosoft.comwas created during registration, try signing in with that account instead of the custom-domain address. - Check the original welcome, trial confirmation, order confirmation, or billing email to identify the exact account used to create the subscription.
It is also possible that the subscription was purchased through a self-service purchase or trial from an existing work account. Microsoft explains that the person who signs up is automatically a Billing account owner, but access to administrative functions still depends on the assigned billing and administrator roles. For MCA billing accounts, relevant billing-account or billing-profile roles are required, while MOSA accounts require at least the Billing Administrator role for administrative billing tasks.
If another administrator exists in the organisation, please ask them to check your account under Users > Active users and confirm whether an appropriate administrator role has been assigned.
However, could you please confirm whether there are any other accounts in your organisation that can still access the Microsoft 365 admin centre?
Please also note that I am only a fellow community user, so the information I have provided is based on my own research. I do not have access to your tenant, and I cannot review your subscription, assign administrator roles, or restore administrative access to your account.
Therefore, please feel free to provide any additional details that may help us better understand the situation.