help with power BI report server with ADFS set up

hi there,

i recently set up power BI report server and would like to set up ADFS for business reason.

i followed this instruction found on github regarding this. but it asks for credentials after inactivity of  30+ minutes like below.

I could not find any info from microsoft regarding setting up ADFS with power BI report server or SSRS 2017. 

Could anyone share instruction how to set it up? 

thanks in advance!

worried user