Unknown account

[Microsoft Windows]

I use Microsoft 365 Business for a monthly rental fee. My chosen email address has the ending “onmicrosoft.com” I also use this email to sign in to my account, e.g. to access my OneDrive. I use a GMAIL email address to log in on my old PC. I have now received a new PC and wanted to sign in with my email address, which I also use to access my Microsoft 365 Business. However, when I log in, I get the message that this account is unknown.How can this be, since I also use Microsoft Business with it?What do I have to do so that I can also log in on a new PC with the MS Business account?My chosen e

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