There are two different ways you can provide to users to register an iOS mobile device.
Manual: Send your users an email with the URL to the IDP server including the correct port number. The users enter the IDP URL in the MobileAccess app by tapping the menu in the upper left corner of the MobileAccess app, then tap Accounts > + to enter the URL of the IDP in the Providers field. The URL is:
https://IDP_server_dns_name:port
For example:
https://idp.acme.com:8443
Embedded Link in Email: You can send your users the following link. When the users click the link, the link launches the MobileAccess app and the user is presented with the Sign In page. The user signs in using their corporate credentials to access the appmarks available in the MobileAccess app. The link is:
comnetiqauth://x-callback-url/register?providerUrl=https://
IDP_server_dns_name:port/
For example:
comnetiqauth://x-callback-url/register?providerUrl=https://idp.acme.com:8443/
NOTE:Email client can prevent embedded links from working.