Similar to this issue Can't setup Discourse ID: Application with this redirect URI already exists My self-hosted Discourse has this exact error. But the thread above was already closed and didn’t see the answer on how to fix, but happy that issue was resolved. Is it possible to help my forum as wel…

This should be resolved via PM now. The original issue was that this instance was registered a while ago, the server has issues, so the site manager had to reinstall Discourse and the credentials didn’t carry over.

Can't setup Discourse ID: redirect URI already exists

Support

pmusaraj (Penar Musaraj) March 9, 2026, 2:02pm 14

Send me a PM with your site’s domain name and I’ll help you resolve this issue. Sorry about this, we’re working on a more straightforward solution.

Topic		Replies	Views
Can't set up Discourse ID: Application with this redirect URI already exists Self-hosting discourse-id	2	28	March 9, 2026
Can't setup Discourse ID: Application with this redirect URI already exists Support discourse-id	4	105	November 18, 2025
The Discourse ID cannot be used after changing the forum domain Support discourse-id	3	102	February 25, 2026
How Discourse ID works Site Management discourse-id	22	1813	January 24, 2026
Changing domain names prevents Discourse ID from working Support discourse-id	3	177	October 19, 2025

Can't setup Discourse ID: redirect URI already exists

Related topics