This API call has quit working in the last GET https://api.powerbi.com/v1.0/myorg/reports
I thought the same thing on the upgraded workspaces, while if they don't work that is an issue in itself, not a small task to correct either, with 100's of reports in multiple workspaces, with 100's of authorizations, creating new workspaces would be a huge job.
So I created new workspaces and shared out some reports, same results, it is as if the API call no longer returns all reports a user has access to. The example PowerBi Embed on Github seems to imply that by having you pick a workspace and then retrieve the reports in it. The command is still there it just does not return what it use to return. The older PowerBI Embed examples showed explicitly how to get the reports a user has access to, that being the API command in the title of this issue.