This error could be caused by a few things, do you have updated protocol? Do you have all the certs required? Are you actually routing through a proxy? Are there any more errors than that?
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There should be an error in splunkd when you get redirected to unauthorized that states what user it was trying to log in as. Also if you changed it from samaccountname to userprincipalname you will have to modify it on the AD/ADFS side as well.
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Currently the above fix is only for Microsoft ADFS, but it is possible using Okta and F5 using the SAML configuration with the prompt being on the IdP side. What is your IdP?
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For web.conf Change the AuthMethod, and add the PivOid list certBasedUserAuthMethod = PIV certBasedUserAuthPivOidList = 1.3.6.1.4.1.311.20.2.3, Microsoft Universal Principal Name
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Anything above 9.2.2 will have the fix, so you should be fine with 9.3. What is the value you are using for userNameAttribute in authentication.conf?
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