This is caused by the Private setting being enabled within your Safari browser.

What is the Private option within Safari? This option protects your private information and blocks some websites from tracking your behavior. As a result, Safari will not remember the web sites that you visit, search history, or AutoFill information.

For more information on Safari web settings within Apple devices, you can visit Apple's support page here .

How to disable the Private setting?
1. Open Safari
2. Press the +
3. Press or click Private (If Private is enabled, Safari wil appear black or dark instead of white or gray.)
4. Select Close All
5. Reaccess the mobile registration form