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.

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Can't set up Discourse ID: Application with this redirect URI already exists Self-hosting discourse-id	2	27	March 9, 2026
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The Discourse ID cannot be used after changing the forum domain Support discourse-id	3	102	February 25, 2026
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Can't setup Discourse ID: redirect URI already exists

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