The version of your onprem deployment appears to be missing the setting you want to add:

You may require an update which contains these settings, I try to do my best to align with the right version #'s but that usually is mostly aligned to Online version numbers as there can be some differences. Support should be able to confirm if the setting is in a given (specific) version of onprem.

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Hi Sean,
Thanks for the answer.
Actually, the settings are available on said version. The problem comes only after enabling IFD. The solution expects only kerberos authentication. The same settings could be updated fine if IFD is not set up. Even before enabling claims-based auth.

Fiddler logs show kerberosmixed is called. Disabling the kerberos endpoint did not help.
The solution itself may call the wrong crmservice.

Could you provide your feedback on the above?
Thank you in advance.

*apologies for the font

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Thanks for the update! Do you have an example you can share of what this looks like in the UI? It should be accessing the API using the auth context of the user who loaded the page - the exception should be what it is seeing from the HTTP response from the server.

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