Since you no longer have access to the account your only option may be to stop the transactions from the card being used.
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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My subscription was registered under my work email. I am no longer with the company, therefore my work e-mail address is no longer valid. As such, I cannot go in to cancel the subscription (email isn't recognized) which automatically renews on March 17th.
How do I cancel this, to ensure I don't get charged on March 17?
Since you no longer have access to the account your only option may be to stop the transactions from the card being used.
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
What service are you trying to cancel?
Microsoft 365 Family