Using Online Services or Online Subsystem
Unreal Engine (UE) now provides two frameworks for accessing online services: Online Services and Online Subsystem. Read on to determine which is right for your project.
Online Services
The Online Services plugins have not been tested in shipping titles. As of UE 5.1, the Online Services plugins are an API-complete version for developers to use with the intention that they will be shipping on a future version of the engine. We also recommend using Online Services for developers targeting their own backend, or those who will be incorporating a number of UE upgrades beyond 5.1 into their project before shipping.
Online Subsystem
Use the Online Subsystem for any title shipping in the near future, or when you do not plan to incorporate any engine upgrades beyond UE 5.1 into the project.
Anyway “Online Services” is a bug with some code… i have been using it for a year… it is completely unusefull… I hate Epic for this… the says use this and this is a crap… the make me waste my time… i won’t report bugs anymore… and i won’t use new features anymore too untill they are complitely tested and consolidate.
You can still using EOS