So my Google play services won't update saying I need to sign in but when I try, it doesn't seem to work
Try below given possible solutions. I hope one of the below given tips fix Google Play services issues.
1st Way: Clear the cache Google Play Services
settings > Apps > Google Play services > Storage > Clear cache
If not work then clear all data of Google Play services storage using below settings.
Settings > Apps > Google play services > Storage > Manage space > Clear all data
2nd Way: Uninstall Google play services updates
Settings > Apps > Google Play services > More > Uninstall update > OK
3rd Way: Remove your Google account
4th Way: Reset app preferences
settings > Apps > More > Reset app preferences > Reset apps
If none of the above trick worked, check Google Play service version, make sure latest version updated.