Supposed connectivity issues when attempting to join any Realm, but no such issue exists. (Xbox One)

Hi there,

I have been attempting to join various Minecraft Realms on Xbox One (not my own Realm) for a couple of days now with little success. Every time I attempt to connect to one I receive the message "Unable to connect to the world. Please check your connection to the internet and try again." 

I have tested my connection through Xbox One network settings and there is no issue there, furthermore, I can connect to servers on Minecraft with no issues at all. My NAT type is open and I maintain excellent download speeds, and multiplayer connection etc., if that is any further indicator. The Realms I am attempting to join already have players playing on them actively with seemingly no issues. As I say I have had no issues but only started to see some in the past two nights. 

Hope you can help me resolve this frustrating issue.