I've added Trello to my Slack team but for some reason it's called "trello2", which is harmless, yet annoying.
How do I rename a Slack bot?
Slack – How to Rename a Bot
botslack
Related Solutions
Have you tried composing a "POST" that is editable by the group? Sounds like it solves the problem within Slack.
Compose a post
Sometimes sharing detailed information with your team takes more than a message. Posts are a way to share and collaborate on long-form content — like project plans, or documentation — directly in Slack.
https://get.slack.help/hc/en-us/articles/203950418-Composing-a-post
Visit https://[TEAM].slack.com/admin/attachments as an admin or owner of the team. Then simply click the X on all the website link previews you want to automatically "unfurl" again.
Best Answer
I am not sure that this is the most elegant answer, but it worked for me ...
It seems that the name "trello" can't be used as both a bot name and a channel name at the same time.
What I did was I renamed my channel "board" and my bot "trello"
If you come up with a better solution, I'd love to hear about it.