My account was deactivated due to Microsoft's 60-day deadline, you must log into your account at least once for it to reset this period.
At least that's what I think.
I saw a “question” about a guy who went through the same thing as me. I soon deduced that this would be the reason why my account was deactivated. Here is the link to the post:
Trevis 
WEB-5015
MCL-23999
[MCQA] Zgajak
My account was deactivated due to Microsoft's 60-day deadline, you must log into your account at least once for it to reset this period.
At least that's what I think.
I saw a “question” about a guy who went through the same thing as me. I soon deduced that this would be the reason why my account was deactivated. Here is the link to the post:
[
https://answers.microsoft.com/en-us/outlook_com/forum/all/that-microsoft-account-doesnt-exist-but-does/c08bd01b-69e6-4c22-8221-3e4c3a2d49d5 ]
From what I remember, I logged into the account within the last 2 months. However, this “deadline” has not been reset?!
[MCQA] Zgajak
Can you at least change my account nickname? So that when I buy again I can put my Nickname and recover my data on the servers.