New Bug Encountered: Data table is not accessible due to: Invalid Credentials

I had an AppSheet app connected to my Google Account.
Today, I noticed that App had error - Data table is not accessible due to: Invalid Credentials

I tried to follow these instructions - https://help.appsheet.com/en/articles/3476900-google-sign-in-warning - to reset the AppSheet authentication & re login. Even after following this I’m stuck with the same error.

Now when I try to create a new app with a new spreadsheet, I’m stuck in the below page.

When I click on Sign in , I get this
The feature you requested is currently unavailable. Please try again later.

Please contact support@appsheet.com for help with this.