Unfortunately, after struggling for a couple of weeks to fix the Telegram integrations, I decided to stop supporting them because of the following two reasons:
As I'm using Telegram integrations extensively myself, I had to find another solution. BazQux Reader seems like a good one. I'm using it for several years as my RSS reader and it was quite a nice experience.
If you have used Notifier only for Telegram integrations, please contact me and I'll issue you a refund for the remaining days.