Problem with extension "Nextcloud Monitoring via Special Agent"

Hello everyone,
I can’t get this extension to work, I always get the same error:
“[special_nextcloud]: Agent exited with code 1: Request response code is 406 with URL”

And when following the link: {“error”: “Strict Cookie has not been found in request”}

I don’t know if the problem is in the plugin configuration or in the web server.
In the plugin I have configured the hostname, user and token.
On the server side, in the nextcloud log I see:

[no app in context] Warning: Request does not pass strict cookie check
GET /ocs/v2.php/apps/serverinfo/api/v1/info?format=json
from XXX by XX at 2023-08-21T15:06:33+00:00

Thank you very much for your help.