If your mail app checks for new messages more than once every 10 minutes, the app’s access to your account could be blocked. Make sure your mail app isn't set to check for new email too frequently.Try signing in directly on the Gmail app. The email client's sign-in method might be insecure.If the tips above didn't help, visit and follow the steps on the page.
If you have these problems or can’t sign in, first check to make sure you’re using the right password.
