Unable to log into realm on cellular data.

The last three days I have been unable to log onto my realm whilst on cellular data, everything works fine on WiFi. My wife has the same issue from her phone too. Previously we both had no problems doing so.

This also prevents logging onto servers.

Have checked cellular data on is selected in profile and have deselected and reselected this. I have logged out of my Xbox account and logged in again. I have even uninstalled Minecraft from my phone and reinstalled all to no avail.

Other apps work fine when connected to cellular data.