So my telegram bot is in this supergroup (private group) and users’ must request to join, and an admin must accept their request.

Searching online, the only solution I saw was using promoteChatMember(), however I get this error:

  response: {
    ok: false,
    error_code: 400,
    description: "Bad Request: bots can't add new chat members"
  },
  on: {
    method: 'promoteChatMember',
    payload: { chat_id: (MY_GROUP), user_id: (MY_USERID) }
  }

Is there at least any way, if this one isn’t possible, to accept user join requests with my bot?

I made sure that the IDs are both correct, but to no luck. I have no idea what to do because I can’t see this issue anywhere on the internet (only 1-2 random topics that have no solution) and I can’t find any Telegram Bot Devs communities.

My telegram bot has all permission settings I can give it with BotFather on checked, and also has every admin right in my private supergroup. I also made sure to remove and add the bot again just to make sure everything is refreshed in the group, but to no luck.