Web version: "create account" does not show up on iphone?


If i access my rocket.chat instance on a iphones browser (tried with safari, firefox and chrome) i can´t create a new account. The page does show up for half a second and then turns into a never ending animated loading screen (3 white dots). if i try to access the same form on open.rocket.chat it works.
That means that something must be wrong with my instance but on the other hand, it works absoluetly fine with my android device, it is just ios that didn´t work. Does anybody have the same problem ?
Any hint is much appreciated.

Version of Rocket.Chat Server: 6.2.9
Operating System: ubuntu 22
Deployment Method: snap
Number of Running Instances: 1
NodeJS Version: 14.21.2
MongoDB Version: 5.0.15