Unable to renew Realm subscription

Currently trying to renew my Realm subscription, which at the time of writing has 13 days left.  However I am able to do so.  When I try I get either "We are unable to connect to the marketplace" or "We were unable to  complete the purchase" and advise to check the internet.  However my internet is fully functional with no hiccups.  Ans as shown in the attached image, I have more than enough gold coins to extend for 180 days, which is what I am trying to do