why does this keep happening to me i cant fix it at all

The message “That Microsoft account doesn’t exist” means the email being entered is not currently recognized as a Microsoft account, even if it is used as a local sign‑in name on the PC.

On Windows, the account shown under Settings → Accounts can be:

• A local account that just happens to use an email address as the username, or
• A Microsoft account that is actually registered online.

If the sign‑in page says the Microsoft account doesn’t exist, that address is not registered (or not registered in exactly that form) as a Microsoft account.

To fix this:

1. Confirm the exact address and domain
   • Make sure the address is typed exactly the same as when the account was created (spelling, numbers, and domain such as .com, .co.uk, etc.).
   • Try any other email aliases or phone numbers that might have been used when first creating the Microsoft account.
2. Use the official recovery flow
   • Go to Recover your account: https://account.live.com/password/reset
   • Enter each email/phone/Skype name that might be associated with the Microsoft account.
   • Follow the steps to receive a security code and reset the password if the account is found.
3. If the email is truly not a Microsoft account
   • If none of the addresses are recognized, then the Windows sign‑in is most likely a local account only. In that case, create or link a Microsoft account separately and then use that for Microsoft services.
4. If the problem continues
   • Run the Microsoft account sign‑in helper at https://aka.ms/sign-in-helper. It will check the sign‑in details and tell what needs to be done next.
   • If the helper still cannot find the account, use Contact support from the article below and explain that the username has stopped working.

References:

• My username and password have stopped working
• Microsoft account sign-in helper
• I can't sign in to my Microsoft account