Managing personal Outlook.com account settings, security, and privacy
As an FYI, AI, including Copilot, is known to hallucinate.
Tenant release happens all the time - for business tenents, because either someone created a Microsoft 365 business tenant then then sold or let the domain expire and the new owner wants to use Microsoft 365. Occasionally someone in a company created a tenant and left the company but did not give anyone admin rights.
In order to transfer, they need to prove they have control over the domain. That will not work for you - but someone at Bell could have Microsoft do it to release all Sympatico addresses. (That would make a lot of people happy.)
If you don't have purchases on the account (other than subscriptions) or are not using it for gaming, you could make a new account - moving OneDrive is fairly easy. Purchases and games cannot be moved.