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Hi VFlood,

I'm not able to reproduce the issue. After you select the Project table to retrieve data in Power BI desktop, is there any other transform steps you have performed in Query Editor for the table before loading? 

Please run Fiddler with below option enabled, also enabled Power BI desktop trace,  then repeat steps to reproduce the issue, share fiddler and Power BI desktop trace with us. You can upload them to your OneDrive and share the link here. 

Best Regards,
Qiuyun Yu 

HI there

My organisation will not allow me to install Fiddler but I have attached a link to the trace files form Power BI which are sitting on my OneDrive here https://1drv.ms/f/s!AnVJmSDJbwTqgdxsymYwlc20oGq14A.  Please also note that the URL I'm using to access my data from OData is http:// not https:// - does that make a difference?

Hi VFlood,

It looks like you are connecting to Project on-premise server instead of Project online. To check if the issue is related to Power BI desktop, please try the same OData feed URL in Excel to see if you can load data successfully. See: https://blog.epmainc.com/connecting-excel-project-server-odata/

Best Regards,
Qiuyun Yu 

I have MS Excel 2010 on my machine and have just requested MS Excel 2013 which comes with the OData functionality. I will test the OData URL once my excel has been upgraded :-) Thanks!