[Doesn't post to my fitness pal]

Any ideas ? It doesn't post to my fitness Pal . Says it has posted successfully but it doesn't show up . 

Says connected in mfp too.

[App quits & resets screen lock]

The app won't run in background if I lock my screen . 

I have given app all the permissions & set to run in background .

It does run in background but as soon as the screen locks . The app quits & doesn't save progress , even if I set the app to lock it still does same .

 

P20 pro android 8