For REST API related common errors in the Applications Manager from version 16310, refer this KB.

How to check Graph API Response in URL Debug tool in Applications Manager?

1. Get access token

1. Go to Application Manager Settings -> Tools -> Self Help Tools -> URL Debug.
   
2. Choose New Monitor in Monitor Name, HTTP(s) URLs in Monitor Type.
   
3. Give the values as suggested below and replace TENANTID, CLIENT_ID & CLIENT_SECRET with respective values:
   
1. URL Address: https://login.microsoftonline.com/TENANTID/oauth2/v2.0/token
   
2. Expand HTTP Configurations.
3. Form Submission Method: POST
   
4. Payload Type: Text
   
5. Request Parameters: grant_type=client_credentials&scope=https://graph.microsoft.com/.default&client_id=CLIENT_ID&client_secret=CLIENT_SECRET
   
1. Ensure that the client secret value does not contain equal to (=) and comma (,) symbol.
6. Custom HTTP(S) Headers:
   
1. Header Name: Content-Type
   
2. Header Value: application/x-www-form-urlencoded
   
7. Click Execute button.
   
8. If the Response code is 200, click the  icon under Webpage content to view the response and copy the access_token value from the JSON response.
   
9. If the response code is not 200, generate a PDF report by clicking  icon and reach out to appmanager-support@manageengine.com along with the latest Support Information File (SIF) from Applications Manager with print all logs enabled for analysis.

2. Get Graph API response

1. After copying the access_token value, click Back to URL Debug.
   
2. Enter the below details to get the Graph API response:
   
1. URL Address: Enter the desired URL listed below.
   
2. Expand HTTP Configurations.
3. Form Submission Method: GET
   
4. Custom HTTP(S) Headers:
   
1. Header Name: Authorization
   
2. Header Value: Bearer ACCESS_TOKEN (Replace the copied access_token value)
   
3. For URLs with $count add the header: ConsistencyLevel: eventual
   
5. Click Execute button.
   
6. Check for the response.
   
7. If the response code is not 200, generate PDF report by clicking  icon and reach out to appmanager-support@manageengine.com along with the latest Support Information File (SIF) from Applications Manager with print all logs enabled for analysis.

How to check Graph API Response in POSTMAN?

1. Get access token

1. To get the access token to hit the above APIs, enter the below details and send the request in POSTMAN.
   
1. Request type: POST
   
2. URL: https://login.microsoftonline.com/{{TenantID}}/oauth2/v2.0/token
   
3. Authorization tab: Type: OAuth 2.0, Add authorization data to: Request Headers
   
4. Body Tab: choose x-www-form-urlencoded
   
1. click Bulk edit and paste the below content
   
1. grant_type:client_credentials
   
2. scope:https://graph.microsoft.com/.default
   
3. client_id:{{ClientID}}
   
4. client_secret:{{ClientSecret}}
   
2. Click Send. In the response we should be able to get the access token as in the image below:
   

2. Get GRAPH API response

1. Copy the access token got from the above steps.
   
2. Make a new request with the below details:
   
1. Request Type: GET
   
2. URL: <URL>
   
3. Authorization tab:
   
1. Type: Bearer Token
   
2. Token: <Paste the Access Token>
   
4. For URLs with $count add the below header.
   
1. ConsistencyLevel: eventual
   
3. Click Send and check for the response. Find a sample response below.