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Hi @Richard Meaden
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, your Outlook/Microsoft 365 license was provisioned through Fin365, which means your mailbox exists inside a Microsoft 365 tenant administered by Fin365, and access to it depends on a license assigned within that tenant. Since you’ve left their platform and no longer have admin access, you cannot renew, transfer, or detach the license on your own.
It’s important to note that Fin365 is a third-party financial services provider, not Microsoft. They manage Microsoft 365 accounts within a tenant they administer. When you joined their platform, a user account was created for you in that tenant, and a Microsoft 365 license was assigned to that account.
Even if you paid for the subscription, the license is owned and controlled by the tenant, not by your personal Microsoft account. Only Fin365’s administrators can remove the account or reassign the license. If the subscription is allowed to expire, the mailbox in that tenant will eventually be deleted according to Microsoft’s retention lifecycle.
In most implementations, Fin365 does not create a separate tenant per customer; instead, they create user accounts within a tenant they control.
I hope this helps clarify how your mailbox and license are currently managed.
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