Vulnerability Fixes - Hide Server Info, Breach Attack

Hi all, 

We have deployed a Power BI Report Server application to PROD and recently received some Vulnerability test results after the pen test. 

There are 2 vulnerabilities pending to be fixed.

1. Server details revealed through headers

2. Application is Vulnerable to Breach Attack 

I managed to fix other issues using CustomHeaders but couldn't resolve the above 2.

Please suggest.

Thanks,

kranthi.