Nepeo Sorry to be a pain, tested out google play again.
I published a duplicate of my game, exported as 'Signed Android App Bundle' instead of 'Signed release APK' and used a new keystore. Assigned new SHA-1 in the API console... Google play sign in and leaderboard now working fine... But this sucks because my downloads for this version are 1 (obviously) instead of 1000+
Do I just delete my main version and start again or does anyone have any ideas why the previous build could be broken?
Note: SHA-1 is correct in API console but I do have a warning about achievements not being correctly implemented, I have them set up but currently no calls from the game. This can't be the reason Google play is broken surely?