Getting "There was an error adding Trello to Slack" when try add Slack app int to Trello Workspace
Welcome to the Community!
Regarding your question, is it possible that you have "block 3rd-party cookies" enabled in your browser or any browser extensions which are related to blocking third-party tracking or ads? Temporarily disabling those might help you to go through the authorization step. Another option is to use another browser to connect Trello to Slack. Once you are authorized, it should work in any browser.
Let me know if that helped to resolve your issue.
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristján Geir Mathiesen for sharing the picture of Taco having fun with his new friend B...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events