Enabling Cookies (Safari on iOS)
1. Locate and click on the Settings application on your iOS device
2. Locate the Safari application within the menu on the left, and then click on it
3. After clicking on the Safari application, locate the Prevent Cross-Site Tracking and Block All Cookies settings.
4. Make sure that both of the Prevent Cross-Site Tracking and Block All Cookies are both disabled, as this should resolve any log-in errors that you are encountering.