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の設定ができません: リダイレクトURIが既に存在します

サポート

pmusaraj (Penar Musaraj) 2026 年 2 月 15 日午後 6:16 2

URLをプライベートメッセージ（PM）で共有してください、ありがとうございます。

トピック		返信	表示
Can't set up Discourse ID: Application with this redirect URI already exists Self-hosting discourse-id	3	64	2026 年 3 月 19 日
Can't setup Discourse ID: Application with this redirect URI already exists Support discourse-id	4	116	2025 年 11 月 18 日
The Discourse ID cannot be used after changing the forum domain Support discourse-id	3	126	2026 年 2 月 25 日
无法登录什么原因 Support discourse-id	9	103	2026 年 4 月 14 日
How Discourse ID works Site Management discourse-id	22	2013	2026 年 1 月 24 日

Discourse IDの設定ができません: リダイレクトURIが既に存在します

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