Prompt In Assistant Does Not Find Required Language Model

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Steps to reproduce

1. Have an account set up and connected to a Nextcloud server with Assistant available.
2. Open the "Free prompt" in the Assistant of the iOS app.
3. Try to start anything with a new conversation.

Expected behaviour

Only an error notification is shown.

Actual behaviour

The server actually is queried with the entered prompt.

Logs

Request:

POST https://cloud.nextcloud.com//ocs/v2.php/textprocessing/schedule

Response (body):

{"ocs":{"meta":{"status":"failure","statuscode":412,"message":""},"data":{"message":"Erforderlicher Sprachmodellanbieter ist nicht verf\u00fcgbar"}}}

Reasoning or why should it be changed/implemented?

Environment data

iOS version: e.g. iOS 18.1

Device: iOS Simulator and iPhone XS Max

Nextcloud iOS app version: Both HEAD of develop as well as App Store release 6.1.6.1

Server: cloud.nextcloud.com

Start by reproducing the free-prompt flow in the iOS Assistant against a Nextcloud server with Assistant enabled, then trace the POST request to /ocs/v2.php/textprocessing/schedule and its 412 response. Done should be defined by the intended handling of an unavailable required language model, but the issue does not identify a source file or test.