Am writing my first telegram bot for group chats with python-telegram-bot package. And faced an issue.
Bot with exactly same rights (all of them, incl. adding new admins)
in my test groups (few users) - can promote new admins and change their custom title, no problem, but
in larger group chat (300+ users) - fails to promote new admins & assign custom titles, and gets
telegram.error.BadRequest: Chat_admin_requiredandtelegram.error.BadRequest: Not enough rights to change custom title of the usererrors.
Using bot.promoteChatMember to promote new admins, and bot.set_chat_administrator_custom_title to set custom titles.
Same bot, same rights, all looks same.
What can be an issue?
Thanks a lot