The last couple days my btag list in-game has been blank, when someone messages me it’ll say “chat 11” or “chat13”. Outside of the game, on the launcher, I can use my btag list just fine. I have disabled all of my addons and the issue is still there.
Disabling addons doesn’t necessarily remove any bad or corrupted files so we do recommend
resetting your User Interface to default.
I did find the following post in Technical Support with troubleshooting advice:
Let’s try cleaning up the Battle.net Desktop Application and then the game client and see if that helps:
From here we need to manually clear the Battlenet Desktop Application and all supporting data from the system. This will not remove existing game clients.
Open file explorer/file manager (Right Click Windows Start)
Navigate to the folder where the desktop application would normally be installed. Delete that folder if it exists (usually program files x86)
Type the following into…
Unfortunately, it doesn’t look like anyone followed up if it worked for them, but you might start there.
Edit: If you haven’t already, you might start by simply logging completely out of Battle.net and then back in. That often can refresh the list. It’s the least painful option to start with.