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I'm running into this too. It works perfectly for me in an Incognito/InPrivate window though. It also works when I delete my browser cache (Chrome/Firefox/Edge). But then after a day or so....back to the same SAML error again unless I go to Incogn...
You can disable SAML/SSO just for RTMT (under System/Enterprise Parameters). It's a crappy workaround, but it works for the time being until you can update CUCM.
