Can't add students to a team - manage team members button missing

As the title says - have just created my first team to use with a coding club. I can’t invite any students though - according to the ‘help’ feature I should have a manage team members button. Any idea why I don’t have one and how to fix? I have created a new team for the photo example - same issue but without giving away school info.

I cant repro this. Can you make sure you are an admin or owner?

I’m definitely down as an org owner.