Created a fresh Server using your Vanilla Guide. When Joining, I get this in the console:
[2022.04.14-17.53.41:747][678]LogOnline: Verbose: OSS: Async task 'FOnlineAsyncTaskSteamUpdateServer bWasSuccessful: 1 Session: GameSession' succeeded in 0.001560 seconds
[2022.04.14-17.53.52:783][ 7]LogOnline: Verbose: STEAM: FOnlineAsyncEventSteamConnectionRequest RemoteId: UNKNOWN [0x7FF0F1615080]
[2022.04.14-17.53.52:783][ 7]LogOnline: STEAM: Adding P2P connection information with user 76561198005468187 (Name: UNKNOWN [0x7FF0F1613DC0])
STEAMPS3 - AsyncTCPSocket created
STEAMPS3 - AsyncTCPSocket created
[2022.04.14-17.53.55:898][100]LogOnline: Verbose: STEAM: Dumping Steam P2P socket details:
[2022.04.14-17.53.55:898][100]LogOnline: Verbose: STEAM: - Id: UNKNOWN [0x7FF0F1614ED0], Number of Channels: 0, IdleTime: 3.114
[2022.04.14-17.53.55:899][100]LogOnline: Verbose: STEAM: - Detailed P2P session info:
[2022.04.14-17.53.55:899][100]LogOnline: Verbose: STEAM: -- IPAddress: 192.168.1.205:49618
[2022.04.14-17.53.55:899][100]LogOnline: Verbose: STEAM: -- ConnectionActive: 0, Connecting: 1, SessionError: 0, UsingRelay: 0
[2022.04.14-17.53.55:899][100]LogOnline: Verbose: STEAM: -- QueuedBytes: 0, QueuedPackets: 0
[2022.04.14-17.53.56:803][127]LogOnlineSession: Warning: STEAM: Server setting ,SNAME_s:Animal Crossing and Anime overflows Steam SetGameTags call
[2022.04.14-17.53.56:803][127]LogOnlineSession: Warning: STEAM: Server setting ,ServerName_s:Animal Crossing and Anime overflows Steam SetGameTags call
[2022.04.14-17.53.56:803][127]LogOnlineSession: Warning: STEAM: Server setting ,HasPassword_b:true overflows Steam SetGameTags call
[2022.04.14-17.53.56:803][127]LogOnlineSession: Warning: STEAM: Server setting ,IsExperimental_b:false overflows Steam SetGameTags call
[2022.04.14-17.53.56:803][127]LogOnline: Verbose: OSS: Async task 'FOnlineAsyncTaskSteamUpdateServer bWasSuccessful: 1 Session: GameSession' succeeded in 0.000906 seconds
[2022.04.14-17.54.05:934][399]LogOnline: Verbose: STEAM: Dumping Steam P2P socket details:
[2022.04.14-17.54.05:934][399]LogOnline: Verbose: STEAM: - Id: UNKNOWN [0x7FF0F1617480], Number of Channels: 0, IdleTime: 13.150
[2022.04.14-17.54.05:935][399]LogOnline: Verbose: STEAM: - Detailed P2P session info:
[2022.04.14-17.54.05:935][399]LogOnline: Verbose: STEAM: -- IPAddress: 192.168.1.205:49618
[2022.04.14-17.54.05:935][399]LogOnline: Verbose: STEAM: -- ConnectionActive: 0, Connecting: 1, SessionError: 0, UsingRelay: 0
[2022.04.14-17.54.05:935][399]LogOnline: Verbose: STEAM: -- QueuedBytes: 0, QueuedPackets: 0
[2022.04.14-17.54.08:268][469]LogOnline: Verbose: STEAM: FOnlineAsyncEventSteamConnectionFailed RemoteId: UNKNOWN [0x7FF0F16175D0] Reason: '4' k_EP2PSessionErrorTimeout (Timeout)
[2022.04.14-17.54.08:268][469]LogOnline: Verbose: STEAM: Replacing all existing removals with global removal for 76561198005468187
[2022.04.14-17.54.08:268][469]LogOnline: STEAM: Removing P2P Session Id: UNKNOWN [0x7FF0F1614EA0], Channel: -1, IdleTime: 15.484
[2022.04.14-17.54.09:801][514]LogOnline: STEAM: Closing all communications with user 76561198005468187
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsncTCPSocket destroyed
[2022.04.14-17.54.09:803][514]LogOnline: STEAM: 76561198005468187 has been removed.