Hi @AmanShaikh ,
It looks like you are experiencing issues with the accessToken parameter not being passed correctly when calling the REST API through the REST connector in the fabric using service principal authentication, the accessToken on the screenshot is currently null.
I think the first thing you can do is to generate it using a tool like Postman or programmatically in code, you can try the following Postman code for generating the token.
POST https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token
Content-Type: application/x-www-form-urlencoded
grant_type=client_credentials
client_id={your-client-id}
client_secret={your-client-secret}
scope=https://api.fabric.microsoft.com/.default
Once you have the access token, you need to include it in the headers of your REST API request. Typically, this is done by adding an Authorization header with the value Bearer {accessToken}.
Also you need to make sure that the service principal has the necessary permissions to access the Fabric APIs. This includes adding the service principal to the Fabric workspaces with at least a Contributor role.
Best Regards
Yilong Zhou
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
