& Finally - Restart Credential Manager Service & Restart Set the Net User as Administrator from CMD & Restart Reinstall the app from Microsoft Store & Restart Restart (Get-AppxPackage Microsoft.windowscommunicationsapps | Remove-AppxPackage)

Remove the app through PowerShell as Admin & Restart

Update the Mail and Calendar app from Microsoft Store > Downloads and Updates Terminate and Reset the app from Settings/Apps/ Mail and Calendar > Advanced Options & Restart Note: When signing into my Gmail account, I give full access to access my account and when the app tried to access the account, that's when I get error code appear. Here are the steps that I've already performed on my computer multiple time's which also includes after every major updates of Windows 10. I've researched online on this error code matter but nothing drastically troubleshooting steps found and no response directly from Windows Team on error code. Every time I tried to add Gmail account, a error code 0x80070490 always brought up.

For long time, I'm trying to add my Gmail account to Microsoft Mail app on Windows 10.

Error code 0x80070490