Another update.
I spoke to Jewel IT help desk about the open Incident Report that I submitted on 3/14/19. Help Desk had asked me to call back if I had any new experiences with a failed Apple Pay transaction. They asked that I report the date, time, store #, amount, etc. Before I had a chance to report any of this stuff, the help desk guy said they were aware of the issue and are working on it. There is no estimate for a fix.
Knowing our help desk, I wouldn't put too much hope into getting a fix soon. But at least we know that someone at Jewel corporate is aware of the issue.
I don't know how this affects customers of Vons, Safeway, etc. It's not clear to me if New Albertsons, Inc. has integrated the IT Help Desk across all divisions or if every division has their own Help Desk.
I guess I would just suggest that everyone with AMEX or Mastercard Apple Pay cards try every now and then to see if they start working. This is not the type of fix that corporate is going to announce in a press release or anything. Just one day, it'll suddenly start working again.