How do I fix correct credentials in Gmail?

Troubleshooting steps

1. Step 1: Update your Gmail app. To get the latest fixes on problems with sending or receiving mail, update your Gmail app.
2. Step 2: Restart your device.
3. Step 3: Check your settings.
4. Step 4: Clear your storage. …
5. Step 5: Check your password. …
6. Step 6: Clear your Gmail information.