Mobile Device Automation - Android/Telegram

I’m trying to automate Telegram on Android 10 device.
Robot is able to operate with two chats only - first and second.
I initialized DialogSelector (string) with {{DialogIndex}} link and use DialogSelector as {{DialogSelector}} in ElementExists/Tap activities, incrementing DialogIndex after processing with a chat.
What’s might be wrong with variables?

Cause I’m a newbie here, I cannot upload my .xaml-file. #sadbuttrue