We have also enabled the JIRA Power-Up in Trello.
Regardless of the URL that we enter into Trello, we get the error "Not a valid JIRA URL".
We can't find any documentation online about this.
Can anyone provide an example of a correct URL?
Or additional configuration that we've missed?
Rich here from the Trello team. Looks like we had an issue with the power-up service validating the Jira server. I've fixed the issue and deployed the fix. Sorry about that. No need to re-install the app/addon inside Jira... just go to your Trello board then try to the integration setup again.