Claims based web app with SSRS integrated mode

Hi,

I've hit a major hurdle with getting SSRS to work with a claims based web app.  The web app was converted from classic to claims and is using NTLM.  SSRS doesn't seem to be reading any data nor giving any error.  We're using a BI webpart together with rdl files.  SSRS was set up by external consultant so my knowledge of this is quite limited.

Ultimately, we want to use SAML-based claims with AD FS on this web app but I want to make sure that SSRS works with windows integrated first.

Can any experts out there shed some light on this please?

Thanks in advance.