[WOPI] Unable to View docx file using office online

Question

We are trying to integrate office online in our web application using WOPI. We have already registered for CSPP program. In our case we are receiving call for files/:id to get the checkfileinfo json but we're not receiving another call to the host server for getting the file contents. i.e. files/:id/contents.

Here is the json response for GET files/:id

BaseFileName: "docusign.docx",
OwnerId: "admin@Ranadheer .com",
Size: 12896,
UserId: "sandip@Ranadheer .com",
UserFriendlyName: "Sandip Rana",
Version: "2022-11-02T16:30:09+00:00",
FileExtension: ".docx",
UserCanWrite: true,
SupportsLocks: true,
SupportsUpdate: true,
UserCanNotWriteRelative: true
}

After returning this json response, ideally we would've got the call for files/:id/contents but that call is not getting invoked by office online. Am I doing something wrong?