Nextcloud Talk Windows Client fails to upload data from server (CSRF mismatch, 404 errors, and incorrect locale errors)

[nassimshahin]

I am experiencing an issue with the Nextcloud Talk Windows Client where it fails to upload data from the Nextcloud server. The developer console shows multiple errors, including:

resources:
bash

404 Not Found errors when accessing user_status, dav/events/upcoming, and other resources:

CSRF token mismatches:
communis.erzbistum-koeln.de/ocs/v2.php/apps/user_status/api/v1/statuses/_:1
Failed to load resource: the server responded with a status of 404 (Not Found)

arduino
Request to https://communis.erzbistum-koeln.de/index.php/apps/files/api/v1/configs failed because of a CSRF mismatch. Fetching a new token

javascript
RangeError: Incorrect locale information provided
at Intl.Collator ()
at J.t (index.js)

javascript
Uncaught SyntaxError: Unexpected token 'E', "Error whil"... is not valid JSON
at JSON.parse

csharp
index.js:1 Session has been marked as inactive
index.js:1 Session has been marked as active

Nextcloud Talk Client
Server: Nextcloud server (URL: communis.erzbistum-koeln.de)
Language/Locale: de_DE

[ShGKme]

Please provide a diagnosis report (see new issue template).

[nassimshahin]

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Steps to reproduce

1. Access the Nextcloud Talk or related app through the provided URL (communis.erzbistum-koeln.de).
2. Attempt to join a call room (/call/r2nkd9ed).
3. Observe console errors and connection failures.

Expected behaviour

The connection to the server should work seamlessly, and calls should be successfully initialized without errors.

Actual behaviour

Several issues occur:

1. 404 Not Found responses when requesting the following endpoints:
   • .../ocs/v2.php/apps/user_status/api/v1/statuses/...
   • .../ocs/v2.php/apps/dav/api/v1/events/upcoming
2. CSRF mismatch errors when accessing configurations:
   • .../index.php/apps/files/api/v1/configs
3. WebSocket connection failures to the signaling server (wss://communis-push.erzbistum-koeln.de/push/ws).
4. RangeError regarding incorrect locale information:

   RangeError: Incorrect locale information provided
       at Intl.Collator (<anonymous>)
   

...

5. Syntax errors parsing JSON responses.


### Diagnosis and logs

<details>
<summary>Diagnosis report</summary>




Insert a diagnosis report here.  
It can be found in the About window (open from the menu or via <kbd>F1</kbd> and click on the "Copy report" button).

</details>

<details>
<summary>Client logs</summary>

#### Console logs:

Using locale "" for language "de_DE"
Failed to load resource: the server responded with a status of 404 (Not Found)
Request failed because of a CSRF mismatch. Fetching a new token...
WebSocket connection failed: wss://communis-push.erzbistum-koeln.de/push/ws
RangeError: Incorrect locale information provided
SyntaxError: Unexpected token 'E', "Error whil"... is not valid JSON
Session has been marked as inactive/active repeatedly

</details>