Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
If you still have access to the credit card statement, Microsoft Billing Support may be able to locate the subscription from the charge details. The charge reference, transaction date, amount, and the card used are often more useful than trying to remember old tenant names or email addresses.
If the subscription is found, support can help identify the associated account and discuss available options for cancelling it. Cancelling the card should generally be considered a last resort, as it may not automatically resolve the underlying subscription.
Please provide the billing descriptor shown on the statement (for example, the exact "MSFT..." reference), the charge amount, and whether the subscription was likely a personal Azure subscription or linked to a Microsoft 365 tenant. That will help determine the best next step.