Automation from iPhone fails when connected to WLAN via repeater

Hi community,

after despareted hours I would like to ask for some help. I’m sure that solution is very easy, but I don’t really know where to search.

Szenario is: I have a switch in HA that can be triggered from my iphone via NFC tag. I use a simple automation from iphone that fires an event. Everthing works fine as long as i am directly connected to my wlan provided from fritzbox 7590. When I am connected to the same network via FritzRepeater 310 (or other repeaters) the automation fails with „unknown error“. In HA there is no reaction.

Other devices (e.g. esp8266) that are connected via repeaters work fine. They can be switched/controlled from HA independend from wlan-access point. Connection via repeater works fine with all ESP devices. I can switch ESPs and I can see in HA if sensors change values.

I can’t figure out if I have to open any ports at my repeaters or if the problem is on iphone or what ever …

Thanks for any help on that issue …