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.

Please share the URL via PM, thanks.

It seems that I don’t have PM permissions yet as a new user, it’s my first time interacting with Discourse. Could you PM me please, if it’s possible?

I’m having this exact same issue. Can I PM you as well? EDIT: nevermind I fixed it myself :slight_smile:

Could you share, how did you carry over the credentials? So that I could also do it myself in the future without bothering the Support?

The problem was with the domain, so I switched to a subdomain and it fixed it.

Hi there, I am having the same issue. I had to create a fresh install and now am getting this when trying to enable the discourse id login. I am guessing due to briefly creating an install before with the discourse id login enabled. I had to destroy that instance and install a new one. Is there a w…

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.

For future travellers, we have updated Discourse to handle this issue. The issues describes here shouldn’t happen going forward, ID will be able to generate new keys if the same redirect uri is used for a new registration.

Discourse ID 설정 실패: 리다이렉트 URI가 이미 존재함

지원

pmusaraj (Penar Musaraj) 3월 9, 2026, 2:02오후 14

사이트 도메인 이름을 개인 메시지로 보내주시면 이 문제를 해결해 드리겠습니다. 불편을 드려 죄송합니다. 더 간단한 해결책을 마련하고 있습니다.

글		댓글	조회수
Can't set up Discourse ID: Application with this redirect URI already exists Self-hosting discourse-id	3	119	3월 19, 2026
Can't setup Discourse ID: Application with this redirect URI already exists Support discourse-id	3	174	11월 18, 2025
Can't regenerate Discourse ID credentials after changing domain name Support domains , discourse-id	4	191	7월 3, 2026
Failed to automatically register with Discourse ID Self-hosting	10	242	5월 27, 2026
The Discourse ID cannot be used after changing the forum domain Support discourse-id	2	264	1월 24, 2026

Discourse ID 설정 실패: 리다이렉트 URI가 이미 존재함

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