How can I use Azure functions to refresh an Azure Key Vault secret every 1H? Have code but not working

Question

Hello,
I'm trying to refresh a token using an API call every 1 hour by a python function on Azure functions,

The base code is as below:

   import requests  
   import os  
   # Set the API endpoint URL and the refresh token  
   api_endpoint = "HIDDEN"  
   refresh_token = "HIDDEN"  
   CLIENT_ID = "HIDDEN"  
   CLIENT_SECRET = "HIDDEN"  
     
   # Set the request headers  
   headers = {  
       "Content-Type": "application/x-www-form-urlencoded",  
   }  
     
   # Set the request payload  
   payload = {  
       "grant_type": "refresh_token",  
       "refresh_token": refresh_token,  
       "client_id": CLIENT_ID,  
       "client_secret": CLIENT_SECRET   
   }  
     
   # Send the request to the API endpoint  
   response = requests.post(api_endpoint, headers=headers, data=payload)  
     
   # If the request is successful, print the new auth token  
   if response.status_code == 200:  
       data = response.json()  
       new_auth_token = data["access_token"]  
       print(new_auth_token)  

In azure functions, it's like this:

   import requests  
   import json  
   from azure.keyvault.secrets import SecretClient  
   from azure.identity import DefaultAzureCredential  
   import datetime  
   import logging  
   import azure.functions as func  
     
   def main(mytimer: func.TimerRequest) -> None:  
       utc_timestamp = datetime.datetime.utcnow().replace(  
           tzinfo=datetime.timezone.utc).isoformat()  
       # Retrieve secrets from Azure Key Vault  
       credential = DefaultAzureCredential()  
       client = SecretClient(vault_url="HIDDEN", credential=credential)  
       client_id = client.get_secret("Client__Id").value  
       client_secret = client.get_secret("Client__Secret").value  
       refresh_token = client.get_secret("Refresh__Token").value  
       access_token = client.get_secret("Access__Token").value  
     
       # Request new access token using refresh token  
       url = "HIDDEN"  
       headers = {  
           "Content-Type": "application/x-www-form-urlencoded"  
       }  
       data = {  
           "grant_type": "refresh_token",  
           "client_id": client_id,  
           "client_secret": client_secret,  
           "refresh_token": refresh_token  
       }  
       response = requests.post(url, headers=headers, data=data)  
       return func.HttpResponse(response)  
       # Check if request was successful  
       if response.status_code == 200:  
           # Store new access token in Azure Key Vault  
           access_token = response.json()["access_token"]  
           client.set_secret("AT", access_token)  
       else:  
           print("Error refreshing access token:", response.status_code)  
         
       if mytimer.past_due:  
           logging.info('The timer is past due!')  
     
       logging.info('Python timer trigger function ran at %s', utc_timestamp)  

When I run it, it returns "202 Accepted", but the secret on azure key vault does not change. If I return the output in a func.HttpResponse() then it shows as follows: The access token expiry UTC time '12/26/2022 1:20:29 PM' is earlier than current UTC time '12/26/2022 2:31:41 PM

Tried powershell instead of python