Custom GPT OAuth issue in mobile app

GPT builders Plugins / Actions builders
, , , ,
1

There is an issue where Custom GPT’s OAuth (External Account Linking) does not work on mobile apps.
It works fine on the web, but it does not work on mobile apps.

After clicking the “Sign in to” button on the ChatGPT APP to go to the web browser and logging in to the external account, when you return to the ChatGPT app, it fails as shown in the screenshot below.

Custom GPT OAuth fail in iOS APP
Custom GPT OAuth fail in iOS APP609×844 65.3 KB

This issue occurs on both iPhones and Android phones.
iOS APP version: 1.2025.031
AOS APP version: 1.2025.028

This issue occurs not only with the specific GPT currently in the Store, but also with the GPT I created for testing. Therefore, I believe it is not a problem with a specific Custom GPT, but with the ChatGPT APP.
I would appreciate it if the ChatGPT APP developer could help me solve this.

2

Please refer to the video in the qr code below. (I couldn’t post the url so I made it into a qr code.)

video qr code
video qr code1003×532 21.1 KB

3

Have you managed to fix the issue?

5

Regarding your screenshot—it looks like you did not add a redirect URI to your OAuth provider.
During creation of Oauth action you should see redirect URI that needs to be used.
https://platform.openai.com/docs/actions/authentication

However, if you have already added all possible redirect URIs to your Oauth implementation and the issue still occurs, then it appears to be a bug.

There is also another issue with GPT Actions that use OAuth: the problem occurs when they are used through the ChatGPT mobile app on Android devices. I opened a thread about it:
https://community.openai.com/t/custom-gpt-actions-with-authentication-type-oauth-does-not-work-on-android-devices/1350646/3