SAML with ADFS, always returns 400 error

I’m guessing this is more related to the configuration of ADFS but I am out of options. We are currently trying to configure SSO with SAML between Keyclaok and a windows server 2016 AD setup, I think I have most of the configuration sat as the authentication flow produces a valid login according to Fiddler, but then a request to “/adfs/ls/wia?client-request-id=2791ba44-f3fe-4c99-1100-0080020000fa” is made wich produces a 400 error. Anyone got any experience with this ?