How to create MTProto with a sponsor?

Question

proxy

Hello! I decided to make a proxy with a sponsor (MTProto) for my telegram channel. I decided to make a proxy according to these instructions https://habr.com/en/post/412759/ . I created a proxy, then it was necessary to bind the proxy to the channel so that when connected it showed the sponsor and there were problems at this place. According to the instructions, I went to @MTProxybot, this bot received the TAG that is required for binding, and then according to the instructions, the code is given by which you need to add or bind this TAG, but it doesn’t work for me, or I don’t understand how it’s done.