Trello powerup not working saying that "This endpoint is invalid"

I have installed GitLab in Ubuntu 16.04 and run it through https with selfsigner cretificates. I’m trying to connect Trello to it however got “This endpoint is invalid”. If I switch back to http it does not help. Could anyone advise me on this?

Thanks!

It appears that it also needs a trello api key, see https://stackoverflow.com/questions/31218141/trello-responds-invalid-key

If it fails on your self signed cert and the gitlab instance is available from the internet, just use letsencrypt/certbot for a free ssl cert that has a CA that is included in the most OS’s.

Thank you! That worked!