Ok, let’s try by checking some extra settings. I will list some settings below, which you should check if your island has the specified value:
- Mode/Structure/Team Size: Dynamic
- Mode/Spawning/Join in Progress: Spawn
- Mode/Spectating/Allow Spectating Other Teams: Disallowed (this setting should not interfere with gameplay but lets test it anyways)
Try with those settings and let me know if it worked!