If your iPad is not operating as expected, try a forced-restart - as this will often clear an isolated software issue:
Force restart iPad (models with Face ID or with Touch ID in the top button)
If your iPad doesn’t have the Home button, do the following:
- Press and quickly release the volume button nearest to the top button.
- Press and quickly release the volume button farthest from the top button.
- Press and hold the top button.
- When the Apple logo appears, release the top button.

Check that Date & Time and TimeZone are correctly set for your iPad - as these settings are known to cause various functional issues if incorrectly configured - in particular with TLS/SSL secure connections:
Settings > General > Date & Time
Ensure that the TimeZone matches your current location. By example, if you are in London (UK):

If the Time Zone settings are ghosted - and cannot be adjusted - you'll need to check (and temporarily change) your ScreenTime permissions:
Settings > ScreenTime > Content & Privacy Restrictions > [Allow Changes] Account Changes - set to Allow
After changing the TimeZone settings, you can return your ScreenTime settings to how they were previous configured.
If your iPad remains unable to automatically set and maintain the correct time for your TimeZone, you can manually set the time. To do so:
Settings > General > Date & Time > Set Automatically - set to OFF
You can now manually set the correct date and time. When manually setting date and time, ensure that you are using an accurate external time source; if not correctly set to within a minute or two of the correct time, many services may not operate correctly - if at all. When manually setting date and time, you must still select the correct TimeZone for your location.