If you run into issues when you try to contact support through chat, try these troubleshooting steps.
Information about problems seeing items that are in your guild or personal bank
Information on error message BLZBNTBGS8000001C.
The Battle.net desktop app is unable to find your game installation in the directory selected.
Information on the level squish introduced with the Shadowlands pre-patch.
What to do if you want help or more information about the Secrets of Azeroth