Update TokenRequest.cs (#397)
Update TokenRequest.cs (#397)

Got caught with this when walking through the tutorials as part of Identity Server.  This is linked to this issue https://github.com/IdentityServer/IdentityServer4/issues/5256

I think extending the documentation to be clear will prevent someone else from trying to misuse the Refresh Token flow to extend the scope
IdentityModel/IdentityModel2,IdentityModel/IdentityModel2,IdentityModel/IdentityModel,IdentityModel/IdentityModel