I am using Collector Classic v. 18.0.3 build 1033. on an Samsung Active2 using Android 9.1.1.
I was testing it out today with a different user and noticed that I couldn't sign his user name out. I "remove" his user name, and attempt to log in with my credentials but it keeps skipping the prompt for credentials right into his account.
I have even tried this on another Sansung Active2 tablet and successfully being able to log in/ log out twice, the third attempt to log in failed to prompt for credentials, despite it being "remove".
This is a major security issue. I don't understand why I can easily logout of Collector on iOS, but not Android.
Please note we have Enterprise logins accounts.
It must be an issue with your phone or some such. I have been using Collector on my Pixel 2 for a couple of years now and quite often switch between user accounts.
Try getting the new version of Collector from Google Play
I don't have any other reference besides the Samsung Active2 tablet. Are you using a regular AGOL account or an Enterprise account? I am wondering if this is one of the issues...
Also, yes I have the latest version of Android Collector Classic.
Could it be because I just recently ungraded the devices from OS 8.1.1 to 9.1.1?