iOS- problem connecting to Horizon Worlds

Hi,  

Ever since Worlds became playable on mobile I have never been able to enter one on my iPhone.  I have checked on my iPad and at least 2 other iPhones, and it always crashes.  I will see the loading bar get to about a fifth of the way loading and then a message appears “Problem connecting to Horizon Worlds”. 

I check again  every time there is an update to the Meta Horizon app on the App Store , and on WiFi (1Gb Nbn fibre connection ) and on 5G, it has just never worked. 

Have also tried reinstalling the app numerous times. 
all app permissions enabled. 
Also I am on iOS 18.5 latest firmware. 

is it just me? Can’t think of what else I can do.