Open projects do not allow guests on the hub as project members. Invites to existing guests will fail. Invites to unregistered users may be subject to Hub admin approval. See illustration below to understand how invites to Open projects work.
Open projects do not allow guests on the hub as project members. Invites to existing guests will fail. Invites to unregistered users may be subject to Hub admin approval. See illustration below to understand how invites to Open projects work.