ActiveSync autodiscover not working for iPhone but for Android and Windows Phone

Hi
We have setup an Exchange 2013 hosted environment, where different mail domains are running on it.
The main domain is mydomain.com. One of the client domains is customer.com.
Autodiscover for customer.com has a cname which points to autodiscover.mydomain.com, on our firewall this url is redirected to autodiscover-s.mydomain.com, where our public certificate for mydomain.com is applied. Autodiscover for all
our customers finally ends at autodiscover-s.mydomain.com.
Outlook WebApp, Outlook Anywhere and ActiveSync for all customers is reachable through mail.mydomain.com.
Everything works fine, except of autodiscover for iPhones. I always have to enter the server name mail.mydomain.com manually. After that ActiveSync works on iPhones as well.
The Problem doesn’t exist on Androids and Windows Phones.
Any suggestion?
Regards
Peter

Yes, Interestingly same configuration is working in my home lab, but not working at customer. The version is 10.5
Cannot say wireless issue as jabber for windows is working from wireless

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