Invalid email on mobile devices

I am trying this and seem to be getting stuck at every hurdle.
I have just tried purchasing tickets using my mobile phone and I get a red dialogue box saying the emails I am entering are invalid.
What could be the cause? Any one have any idea?
I am using the latest version on joomla 3

regards
David

Hi David

I don't have any clue about it (remember I replied this question via email or support ticket before). Maybe you have Prevent Duplicate Registration config option set to Yes and use an email which has registered for the same event before and it causes the issue?

Have you tried to use a different email? Could you send us the link to the page so that we can try ourself, too ?

Regards.

Tuan