Friend Credits not given

Invited my friends to all come play through my link. was their first time on the site and so we thought we would all play together first. got 0 credits from inviting them through my link even though they created a profile and account through the link.

Did not get a single credit for them joining which made it impossible to play together due to lack of enough credits to get even 10 actions.

And theres no way to contact the devs about this.