Mailing problem

I'm playing on android phone and today I sent monster to my friend, who had just started playing. He uses iPad mini. I couldn't make a mistake in nickname, because he was in my friend list. But he doesn't receive anything. And when Im trying to sent him a letter I have a notification that user doesn't exist.
What should I do?

[support9]

I'm playing on android phone and today I sent monster to my friend, who had just started playing. He uses iPad mini. I couldn't make a mistake in nickname, because he was in my friend list. But he doesn't receive anything. And when Im trying to sent him a letter I have a notification that user doesn't exist.
What should I do?

Hi there,

We're sorry to inform you that iOS servers and android servers cannot cross. You cannot befriend/mail/player/combat against...etc. an iOS user in an android server and vice versa. These were determined by the iOS and android texture and OS difference.

Sorry for any inconvenience caused.

Best,
Angela
Haypi Team