Habdroid just says "OK", fails to load sitemap

Hi All

I just upgraded from OH 1.7.0 to 1.8.3 because my.openhab.org switched to myopenhab.org.

I had the expected teething troubles, mostly with my gcal integration but got there in the end.

I’ve registered with myopenhab.org, UUID and secret work fine in a web browser on my PC and on my phone but I can’t seem to get HABDROID (android phone) to work on 4g. I get a pop-up that just enigmatically says “OK”.

HABDROID on WiFi still works fine. Access from my phone using Chrome over 4g works fine. What am I missing?