Delete "onmicrosoft" account

Question

I recently created an account using my work email and connected it to the organization of my work in order to use power apps. I didn't use the account. Eventually, my work has now moved over to Microsoft completely and I have a new account. It seems this old account is causing issues/conflicts between accounts and I would like to remove/delete it altogether.

The conflict seems to be because the email address is the same for both accounts, although the first one I made myself has a "onmicrosoft" suffix attached to it.

I have spoken with my administrator and he can't see this account from the admin side.

The problem is when I try to create a mailbox for the account in outlook it says I don't have a license attached, I can access my work mailbox via the Outlook web portal so it does work.

Work account - ******@sgaccess.co.uk (this one I need to keep)

Old account - ******@sgaccesscouk.onmicrosoft.com (this needs deleted/removed from organization)

any help would be appreciated

Answer 1

This mail account is not visible in web access so it can be removed?

Or

Control Panel (view by large icons > Mail Applet (Outlook) > Email accounts > Email Tab ; the mail account is not shown so it can be removed?