UE5.4 EOS initialization problem - PreferredUniqueNetId is not valid

Can you check if you have these 2 bug fixes:

https://github.com/EpicGames/UnrealEngine/commit/d23b876b7cc8dbe8d06ec40c20733e6d078273c6

https://github.com/EpicGames/UnrealEngine/commit/5abea216fc65eebecb46856ef779d269b8801407