Login to web using device is impossible because fingerprint phrases don't match


I’m trying to log into the web using the “use my device” option. But I never get a notification on my device, and the fingerprint phrase that the web page tells me to expect doesn’t match what my device says it is. Moreover, every time I “retry” on the webpage, it changes the fingerprint phrase to expect, which is even more odd because I thought it’s supposed to be immutable for a given account.

Am I doing something wrong?