hybrid solution – HTTP Error 400. The request hostname is invalid using SharePoint Application Proxy

Has anyone else experienced this error after completing the SharePoint Application Proxy deployment?

I have the Proxy connector set up and I have added all the required information in my Azure Active Directory(Internal URL and SPN for SSO). When I run the Test Application Proxy Configuration report, I have all green checkmarks(picture below). So I am confused as to why I am getting this error.

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