Trying to sign into Microsoft Store, but keep on getting the message 'This account doesn't exist'.

[Windows 11]

Hi there! I am a student and I am trying to get the new look for all my Microsoft apps. I went to Microsoft Store and found that I wasn't signed in when it kept asking me to pay apps that I already have downloaded. So that's what I did, or should I say tried to do. I have entered both my email addresses that I have tied to my account. For example: *** Email address is removed for privacy *** and *** Email address is removed for privacy ***. Both of them have worked unsuccessfully. I would like to know what to do in order to sign in with either of these accounts.

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