[Quoth]

Thanks.

It's
Android 8.1.0
Kernel 4.4.103
BYRead-V3.1.1-2021081711

Borrowbox was last used just over a year ago. I had to go to Web and both renew library account (Local library) and set a new PIN, hence the new sign-in

EDIT:
My phone that stays in library for 2FA (mostly SMS) is Android 7.0 and Kernel 3.18 and last patch 5 Jan 2019.
Borrowbox on same Library account is working on it, but it didn't sign itself out because not used since Library renewed.

It's up-to-date on updates.

My 11″ tablet was a new sign-in. It's Android 13.