---
title: "Google sign in fails with a redirect URI mismatch"
url: "https://demo.myforumcat.com/q/72/google-sign-in-fails-with-a-redirect-uri-mismatch"
forum: "Demo"
question_number: 72
category: "General"
tags: ["API Keys"]
status: "solved"
solved: true
votes: 16
replies: 6
views: 187
asked_at: "2026-07-12T19:23:31.415Z"
updated_at: "2026-09-18T23:17:55.272Z"
---

# Google sign in fails with a redirect URI mismatch

Asked by Jane Cooper on 2026-07-12 · 16 votes

We are seeing a redirect URI mismatch error when a customer tries Google sign in on our custom domain.

## 6 replies

### Reply 1 (marked as the solution)

meow (Owner) · 2026-07-12 · 5 votes

Custom domains need their own callback URL added to the OAuth client authorized redirect URIs, the default subdomain one does not cover it automatically. Send us the domain and we will add it.

### Reply 2

Marcus Lee · 2026-07-13 · 1 vote

Ran into this too, took about a day after asking support to add ours before it started working.

### Reply 3

Kai Tanaka · 2026-07-13 · 1 vote

Took about a day for ours to get added too, matches what is described above.

### Reply 4

Tom Whitfield · 2026-07-14 · 1 vote · In reply to Reply 1

Does this need to be redone if we rotate our OAuth client secret later?

### Reply 5

meow (Owner) · 2026-07-15 · 2 votes · In reply to Reply 4

No, redirect URIs are separate from the client secret, rotating the secret alone will not affect this.

### Reply 6

Mei Lin · 2026-07-15 · 1 vote

Ours got added within a few hours actually, seems to depend on how busy support is that day.