On Friday, 20th morning, something similar happened to me (and about 60% of other passengers) at SAN. Had checked in via the app, had boarding pass (and screen shot), and checked a bag. Got to airport 3hr early to PACKED lobby and long lines everywhere. Went to kiosk and instead of boarding pass and bag tag, got two pieces of paper that said something along the lines of "we had trouble retrieving your boarding pass/bag tag. See agent." Ninety minutes later (only 1 agent working priority line) finally got bag tagged, but still no paper boarding pass. Remarkably, the agent was cool and kind to me and everyone before me. Fog rolled in, flight delayed, missed connection in PHX but luckily still had a couple seats left on last available flight home to DSM. Spent 5hrs in Club, got work done and home 6hrs late. I love the folks at AA, but geeze their tech and logistical crew-movement, maintenance, flight handling leave a lot to be desired. They saved me during the pandemic as only airline with any significant service out of DSM but were awful before and now again after. LOTS of room for improvement.