Luckily, you could read this post fromMiniToolto find the methods to fix it.
Then take a stab at enter with the associated username and password.
Then you might create a new account with the same mailbox name.

In your daily life, you’re able to get in many devices and websites with Microsoft account.
Thus, its important to secure and protect your Microsoft account.
you could try some familiar usernames and passwords that you may have used recently.
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Then you could see if the user ID does not exist error still persists.
Be careful and avoid pressing the incorrect key accidentally.
- take a stab at sign on from another secure computer.

Step 1:You should go to theMicrosoft Account siteand clickSign in.
Step 2:Then input your account and clickNext.
Then you gotta clickForgot password?
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Step 3:Then you could choose a method to verify your identity.
Whats the difference between a local account and Microsoft account?
Here is the information on Windows 10 local account vs Microsoft account.
The End
Here are possible solutions to the user ID you entered does not exist error.