Unable to View Project

I'm using YouTrack in the cloud. I've created a project on which I'm admin and I'm trying to assign users to the project. If I add external users they can see the project on the project list but when they click on the link they get this

{{infoCtrl.project.name}}

and no access to the project.

If I give them the 'project admin' role then they are able to access the project (which I'd rather not d). 

Am I missing something?

Thanks