I\'m facing the same issue as in Stack Overflow question "Google Play services are updating" in Google Maps API.
Unfortunately, out of nowhere, some o
AFAICT there is nothing an app developer can do to fix it. As @xomena mentions in her answer Google is working on it.
Just to add the complete solution for an end-user here:
Settings
> Apps & Notifications
> App
> Google Play Services
> Storage
Clear Cache
Manage Space
and click Clear all data
Be aware that the issue reappears if you reboot your device
Someone created a video you can refer your users to at https://youtu.be/VgMtZnyem5Y