Power Bi Report Builder URL link showing Error

Hi All,

I was wondering if you can help me, we recently started making Power Bi Report Builder Reports where I work and I included a URL in a table of the paginated report. When I load the report in Report builder locally, the URL works, and it works if I put the URL into Power bi desktop and a power bi desktop report. However when I click the link in the paginated report in a power bi workspace I get the following error: 

code":"InternalError","subCode":0,"message":"Internal error ApiException.Unauthorized","timeStamp":"2021-11-15T16:21:31.8911567Z","httpStatusCode":401,etc.

The link is to microsoft projects. Does anyone know how to resolve this? 

Many Thanks,

Mark