On Windows 11, adding an extra user means you're either creating a local account or connecting an existing Microsoft/Entra ID account. Once created, Windows will show “Other user” on the sign-in screen, but the account isn't usable until you sign in with valid credentials at least once.
- Create the new user (which apparently you already have done)
- Press Win + I to open Settings.
- Go to Accounts → Family & other users.
- Under Other users, click Add account.
- If you want to use a Microsoft account, enter their Microsoft email.
- If you want a local account, select I don't have this person's sign-in information → Add a user without a Microsoft account, then set a username and password.
- Activate the user (first sign-in)
- Once created, the account won't fully exist until it's signed in at least once.
- On the login screen, click Other user and enter the new account's username and password.
- Windows will take a little longer the first time (setting up the desktop, apps, etc.).
After that, the account is active and will appear on the login screen like your main account.
- (Optional) if you want to give the new user administrator rights:
- Go back to Settings → Accounts → Family & other users.
- Under the account, click Change account type.
- Choose Administrator.
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hth
Marcin