Unable to programmatically add/update Azure Function Key - azure

Question

When attempting to programmatically add/update a function key, I receive the following error:
StatusCode: 401, ReasonPhrase: 'Unauthorized'
Code:
Executing the following code results in the error described above.
static void FunctionKey(string resourceGroupName, string functionAppName, string functionName, NameValuePair kv)
{
var resource = $"subscriptions/{SubscriptionId.Value}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{functionAppName}/functions/{functionName}/keys/{kv.Name}?api-version=2022-03-01";
var httpClient = new HttpClient() { BaseAddress = new Uri("https://management.azure.com/") };
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", AuthToken.Value);
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var json = #"{
""Properties"": {
""Name"": ""ApiKey"",
""Value"": ""some_value""
}
}";
using (var content = new StringContent(json, Encoding.UTF8, "application/json"))
{
var response = httpClient.PostAsync(resource, content).Result;
if (!response.IsSuccessStatusCode)
throw new Exception($"Error: Failed to register function key for {functionName}");
}
}
Research:
I was successful when performing this task in the the documentation emulator.

Answer 1

I tried to reproduce the same in my environment via Postman and got below results:
When I ran the below query without including bearer token, I got same error with 401 Unauthorized like below:
PUT https://management.azure.com/subscriptions/<subID>/resourceGroups/<rgname>/providers/Microsoft.Web/sites/<funcappname>/functions/<funcname>/keys/<keyname>?api-version=2022-03-01
{
"Properties":
{
"Name": "keyname",
"Value": "xxxxxxxxxxxx"
}
}
Response:
After passing the token, I'm able to create function key successfully like below:
When I checked the same portal, srikey appeared under function keys like below:
In your case, you are using httpClient.PostAsync which means
POST method.
When I used POST method for below query, I too got 404 Not found error like below:
POST https://management.azure.com/subscriptions/<subID>/resourceGroups/<rgname>/providers/Microsoft.Web/sites/<funcappname>/functions/<funcname>/keys/<keyname>?api-version=2022-03-01
{
"Properties":
{
"Name": "keyname",
"Value": "xxxxxxxxxxxx"
}
}
Response:
To resolve the error, make sure to use PUT method by changing httpClient.PostAsync method to httpClient.PutAsync method.
Reference:
HttpClient.PutAsync Method (System.Net.Http) | Microsoft