Hi Scott Anderson,
I honestly understand your frustration. Getting locked out of RDP after a simple email alias change is a notorious quirk of how Windows handles Microsoft Account (MSA) authentication.
Here is the technical reality of what happened: When you changed your primary alias from Comcast to Gmail, your underlying Microsoft Account remained exactly the same. However, RDP relies on the local security cache of the host laptop. By adding the Gmail address as a new user, Windows got confused. It now sees two local profiles trying to claim the exact same Microsoft Account identity, which completely breaks remote authentication and prevents the system from generating a new Windows Hello PIN.
To fix this identity conflict and restore your RDP access, you need to consolidate the account and force a local security sync. Here is the exact path forward:
1. Remove the Duplicate Account Physically log into the laptop using your original user profile. Go to Settings > Accounts > Other users and completely remove the "new" user profile you created for the Gmail address. You only need your original profile, as it is still tied to your MSA.
2. Force a Local Credential Sync While still logged into your original profile (and connected to the internet), go to Settings > Accounts > Your info. If you see a "Verify" link, click it and follow the prompts. Next, lock the computer (Win + L) and unlock it by typing your actual Microsoft Account password (do not use your PIN). This forces the Windows local security authority to reach out to Microsoft's servers and update its internal cache with your new Gmail alias.
3. Use the Strict RDP Username Format When you attempt to connect via RDP from your other machine, do not just type your email address. You must explicitly tell the RDP client to use the Microsoft Account authentication provider. In the username field, type exactly this format: MicrosoftAccount\******@gmail.com (Note: Literally type the word "MicrosoftAccount", a backslash, and then your new Gmail address). Then, enter your standard Microsoft Account password.
I hope this technical breakdown clarifies the conflict and gets you successfully connected. If this resolves your RDP issue, please click "Accept Answer". Should you run into any errors during the sync process, feel free to leave a comment!
Tracy.