The choice was when you first logged into TBC classic. Stay in classic, move to TBC, or cloned into both.
My guess is hopefully they got to you already since someone else pulled this up 5 days later.
Access to the game.
Support for Blizzard actually covers multiple games now.
They still have a live chat from time to time, but the pandemic did curtail that availability.
Try uninstalling, then reinstall just the app launcher.