I'm on an older release but can you go on to Gallery Admin and check under the credentials tab there? The endpoint v3\credentials is an Admin one and it's pulling the credentials found under admin\Credentials tab. I'm thinking DCM Credentials are or will be a different endpoint.
I ran the api using Postman and it worked. If you have postman, it might be worth setting up and trying there.
https://help.alteryx.com/20223/en/server/api-overview/alteryx-server-api-v3/how-to-use-postman.html#idm45958636509968
Thanks for for the response. I also tried in postman and just get a blank response as well.
In the gallery, we definitely have some entries.
Thanks Tim, we definitely have credentials - 3 synced from designer and one I created manually in the gallery but none of these are returned by the API. Other APIs work such as get users etc.
You are correct. The existing API only works admin credentials and it does not return the user credentials. With the admin credentials it does not retrieve the actual id and password so it is kind of no use to us. I will raise a feature request. Appreciate all the help.