Cannot log into my account on one phone, can log in to another

I have a personal Pixel 11 Pro XL and a Pixel 10 that I use for work.

My work phone can log into the Delta app without any problem. I

My personal phone, however, cannot no matter what I try. Same username/password, same frequent flyer number, and last name. No matter what the combo is, it won't work.

I also tried changing my DNS, wiping the data from the app, reinstalling the app, using different wifi networks. Same result each time.

This has been happening for the past three weeks. Had no issues before my international trips.

Has anyone experienced this?