Problem with chat settings

Hi all
I have repeatedly tried to find out the cause of my problem, but unfortunately all to no avail. I decided to try again, maybe in the end some good Samaritan will help me figure it out. So: a problem with setting up a chat, namely: somehow it happened that I can only write to myself, but not to another user. I have two different applications, in one everything works perfectly, and in the other with such a bug. I deleted all the settings many times and did everything again exactly the same as in a correctly working application, but the error is still there. If there is someone who can join me as a developer, find and fix this damn mistake, then I will personally conduct a magical rite of pumping his karma by 300 points)))

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