Follow and Invite

Follow and Invite is not working: 

In my platform, we have Enable in Permissions the Connect module.

On Navigation, we have visibility for all members: 

We can't see the Follow Button: 

With the invitation feature, we can see the button but it doesn't work (any action after clicking, no one receives the invitation to join). 

Any developer can check these issues? It is very hard to launch and try the platform if we have these problems. We can't open the access yet! 

*DM if you want Operator access. 

Thanks!