Hi Erin - after some investigation, our team has updated the URL for the business -API in our deployment configs. Please let us know if you continue to have issues.
Hello, These entities you are trying to search do not exist on the modern application, only in the legacy application. That’s why you are not able to search for them using the modern API. These need to be looked up in COLIN. Also please be aware that the SANDBOX environment doesn’t not always have the same information that we would have in the PROD environment.