One other thing I wanted to add in regards to the article posted by @Colin. I implemented this solution previously. When I upgraded from v8.1 to v8.6 and found I also was getting the error mentioned in Colin’s post and as mentioned in this one. Upon searching for the solution, I discovered his post and decided to implement the second piece of the his solution only, since I had previously implemented the Server Variable part of it, in my initial IIS implementation mentioned above. Upon doing so, I still got the error. I then decided to change the previous implementation of the Server Variable from X_FORWARDED_PROTO to HTTP_X_FORWARDED_PROTO and it turns out this did the trick. So it seems it is very important to keep this naming structure exactly as mentioned in Colin’s post. As soon as I did this, everything worked as expected with SAML. Thanks for the tips @Colin.
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