Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Sorry to hear you're having trouble.
I'm afraid that support would be unable to help if you do not have access to your account as they would deem it a privacy issue. Please follow the steps listed at this support link https://support.microsoft.com/en-us/account-billing/forgotten-your-microsoft-account-username-b2049472-3b8f-27d3-61c6-67a668453f4c to see if anything helps you remember your login information.