What should I do if Diablo 4 Error 316 persists after trying common fixes?

If Error 316 continues after trying all common troubleshooting steps (restarts, client fixes, network checks), it's advisable to contact Blizzard Customer Support. Provide them with detailed information about the error, the steps you've already taken, and any relevant screenshots. They can investigate your account status, license validity, and provide more advanced solutions or confirm if there's an underlying server-side issue that hasn't been publicly announced.