Power Bi Report Server integration with ADFS

hi everyone,

I'm trying to setup a adfs login later with MFA on my Powerbi report server which will be access internally

I've seen this article and follow the steps: https://docs.microsoft.com/en-us/power-bi/report-server/connect-adfs-wap-report-server

Ive finished the guide and tried to access the site. but got an error. some of the screenshot is below

hope you can help me

Report Server Configuration

when tried to access the URL configure on the external. I encounter an error