How to save data for an application(username/password)

[JKarhani]

Hello,
for Android 5.0
Same application on 2 phones, it has a username and password.. On one phone the login credentials are saved while on the other not saved.
I cleared its data & cache & re-enter them but still nothing. Any solution?

 

[Rukbat]

Different versions of the same app, maybe? Make an apk (using Apk Extractor) of the one that works, uninstall the one that doesn't and run the apk in that phone (use a file manager, find the apk file and tap it), See if that fixes the problem.