Hi,
Download the latest version of unreal engine and check the online google plugin in the new version.
Compare it with the old version plugin that is currently being used.
New Plugin location: C:\Program Files\Epic Games\UE_5.4\Engine\Plugins\Online\OnlineSubsystemGoogle
old plugin location is also same just difference of unreal engine version.
compare OnlineSubsystemGoogle with the old version of plugin
The new one has some differences.
Let me know if this works.
Hope this helps you…
#HappyErrors