So I bought my ticket 2 weeks ago using my new Explorer Card on the UA app.
(I realize I said in the post immediately above I was going to buy it with Apple Pay, but long story short I was able to book after all using the new Explorer Card.)

My app still shows bag fee of $35 for my trip.

I talked to customer service and they said the reason is my Explorer Card wasn't linked to my MP#.
There's no way that's true because the Explorer Card has my MP# on it and I have the Explorer Card registered in my Wallet online and on the app (been that way since I bought the ticket 2 wks ago).
I told that to the rep who transferred me to UA's online support desk.
But that department told me they didn't know how to fix the problem.
I called UA again and was told I should check in at the airport counter and the counter agent can waive the bag fee.

I don't want to wait in line every time to check in going forward.
Frustrating that UA can't resolve this issue so that, in the future, I can check in online with fees waived and then head straight to bag drop at the airport.

Has anyone experienced this? Any suggestions on how this could be resolved?