How do I fix YouTube sign in error?

Troubleshoot sign-in problems on mobile & devices

  1. Make sure you’ve updated your YouTube app to the latest version in Google Play.
  2. Uninstall and reinstall the app on your device (even if you have the latest version).
  3. Make sure you’re using a Google Account to sign in.
  4. Try adding your Google Account to your mobile device using the instructions for Android devices.

For More Information Please Refer:
https://support.google.com/youtube/answer/3079858?co=GENIE.Platform%3DAndroid&hl=en
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