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Hi @Pottsk The F5 article shared by Freddy has this to say about someone sharing a team:
It isn't clear to me from that information if the recipient of a F5 link needs to have the F5 feature or not.
Just in case here is how to check your features:
From your home page click on the settings button
In the Settings screen select the arrow next to Features
The Settings/Features screen will show you which game features you have
So I would guess that without having F5 in your Features then link, or not you will not be able to join a F5 team.
Unfortunately, and as I am sure you are aware, not everyone gets the same Features as they are randomly delivered to groups of players rather than everyone at the same time.