GPGS Reporting score/progress doesn't work

Hello,

I am experiencing a problem for a while and I was wondering whether someone here will be able to help me. Basically I have a game made with unity which is currently published in the google play store for which I am trying to get the google play game services to work. I added a new game in the game services, I linked the game with the OAUTH 2.0 client and I did what has to be done with the code.

The problem is that when I try to report a score or progress on an achievement, for some reason I never see it in the leaderboards/achievements UI. The signing in works perfectly so does showing the UI. The only problem is with the reporting.

I tried everything I could think of, if someone can help me I will really appreciate it!

Thanks in advance!

PS: I tried it on different phones, on different android OS versions, with different google accounts, with alpha, beta testing and published. Anti-piracy is also turned off.