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Hold on a second
Which actual screen are you at when you input a name and get the reject? When creating a POP3 account, the first screen you get is the E-mail Address setup. This, clearly, would be the the e-mail address your service provider established. Clicking on NEXT brings you to the User Information screen, whre you put your real name, the USER name that your service provider requires in order for you to obtain your e-mail, and the Password. Clicking on NEXT then brings you to the Account Information screen. This has a box for select what type off account it is (i.e., POP3) and inputting the name you want to give this e-mail "connection". Now, when I attempt to create a bogus test e-mail account and get to this point, I can force the error you describe by inputting the exact same e-mail connection name that I used for my real POP3 account. Is this the place your referring to? If it is, then you can name this anything you want, to describe what this e-mail account is (i.e.,"My Primary POP3"). It doesn't impact how the account works.
However, if you're bound and determined to call your email account connection the exact same thing, get a registry editor and try to locate all instances of that name in your registry. I think it's a fair guess that in the HKLM\Software\Microsoft\Inbox\LdapInfo you may still have an entry with that name in it. You might try deleting that entry if it exists and see if you can enter the name again.
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