### Steps to reproduce

1. Login as an admin on QA edge and go to Admin > Files

2. Add a new Nextcloud storage

3. Choose 'SSO through OIDC' as an auth method

4. Choose 'Define audience manually' and enter `nextcloud-stage`

5. Chose AMPF and save the storage config

6. On the right side, click on 'Recheck connection'


### What is the buggy behaviour?

* Begin of the insertionHealth check shows theEnd of the insertion Begin of the deletion Generic error message aboutEnd of the deletion storage Begin of the insertionas healthyEnd of the insertion Begin of the deletion content is showingEnd of the deletion


### What is the expected behaviour?

1. Begin of the insertionHealth should show an errorEnd of the insertion Begin of the deletion Not completely sure tbh

2. A more helpful error, that mentions the storage audience, would be idealEnd of the deletion


### Notes

(from Jan, in the comments) Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion This is a misconfiguration that's possible on Edge or other environments with multiple clients that you can exchange a token for.

In this case the token exchange succeeds (there is a client that you can exchange a token for) but in the end using the token at the storage fails (because you exchanged a token for the wrong client).

### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" Begin of the insertionsrc="/api/v3/attachments/375044/content">End of the insertion Begin of the deletion src="/api/v3/attachments/365642/content">End of the deletion

### Environment information

**OpenProject version**

Core build

[7fdfce2cd574a3ccd6e2a8ffe0a6bb2a46baddfc](https://github.com/opf/openproject/commits/7fdfce2cd574a3ccd6e2a8ffe0a6bb2a46baddfc)

Product version

[c32c642cd2201e798210c2ddb73f1358c34aa61e](https://github.com/opf/saas-openproject/commits/c32c642cd2201e798210c2ddb73f1358c34aa61e)

Core version

OpenProject 15.5.0

**Browser**

* [ ] Chrome
* [x] Firefox 136.0
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [x] Windows 11Pro
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)