onmicrosoft personal account

[Mark_Aurit__MARKAURIT]

I recently purchased a personal 365 account - the process was complex enough that I had a support personal help me set up an account and a few apps. Now I realize I did a huge no-no - I let him create a <name>@<domain>.onmicrosoft.com account without my putting the password in my password manager. I dont even know where this account exists much less how to change the password. Any help would be greatly appreciated.

[#2]

@Mark_Aurit__MARKAURIT 

Hello! You've posted your question in the Tech Community Discussion space, which is intended for discussion around the Tech Community website itself, not product questions. I'm moving your question to the Microsoft 365 space - please post Microsoft 365 questions here in the future. 

[#3]

@Mark_Aurit__MARKAURIT 

Any information on hand so you can reset by Microsoft support help in the worst case?