I had the exact same issue (error message) and spent hours upon hours working on the issue. Finally broke down and called support. They said you need to have cert profile enabled under the authentication tab for both the Portal AND the Gateway. I was like no that won't fix it.... well I was wrong as soon as I also enabled the cert profile on the Gateway as I only had it enabled on the Portal it immediately worked. I was like dam! So anyway check that!
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