Hey!
So, the service account (SA) you have configured in the Chronicle Integration doesn't use the same API as the endpoint you're trying to use. All methods under Chronicle API (Alpha1) require an SA in the project associated with your deployment—this would be a project from your organization.
Chronicle Integration leverages an SA in a Google-managed project and uses different API methods.
Are you trying to get a list of alerts to use in the playbook? Is there any specific data you are trying to retrieve?
If all you want to do is use the endpoint and capture the response—basically just hitting the API—you could use the new GoogleCloudApi integration (you will need a new set of credentials—a new SA). Then, you can pretty much use any endpoint under the Chronicle API, depending on the permissions of the SA. If you can provide additional details about your use case, I might be able to give you some alternatives and more details on how to implement it.
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