Invite code failed

I enter an invite code and I didn't get anything. And i know it's a valid code. Is there anything that can be done.

[support9]

Dear Zerosky,

First of all, please note that android servers and ios servers are not crossed so you can't refer and can't be referred by friends who play on ios servers.

If the code is valid and you've successfully referred your inviter, then you and your inviter will become pals. When you reach LV 15, your inviter can receive a Pal Gift and vice versa.

If an error occurred during your refering procedure, you will receive a notification from our system. If you received any error notifications please feel free to share the contents with us.

Looking forward to hearing from you.