Hi @chuahew ,
I am using SSRS 2019, when I execute the GET method against the SSRS REST API Reports, ParentFolderId is not NULL. I need to install SSRS 2017 in order to test.
I found an article that took SSRS2017 as an example. The image shows that ParentFolderId is also NULL, for your reference: SQL Server Reporting Services Rest API.
Best Regards,
Joy
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