The garbage can - that’s not good.
I found a utility from The Windows Club called FixWin 11.1. I ran the “System File Checker Utility” on the opening page just before I went to bed last night. This morning when I plugged into the offending TB port, it worked! Goodness knows if the utility fixed it or if Windows just changed its mind. Anyway, it’s all good now. BTW - FixWin 11.1 is free.