Hi @Robin Bosshard , this indicates that the domain name you are using in the user principal name is not one of the verified domain names in your organization. Please make sure that you are using one of the verified domain names in your organization. You can check the list of verified domain names in the Azure portal by going to Azure Active Directory > Custom domain names. If you have already verified the domain name and it is still not working, please make sure that you have waited for the DNS changes to propagate. It can take up to 72 hours for the DNS changes to take effect. Also, please make sure that you have entered the correct domain name in the command. You can verify the domain name by running the following command:
echo ${K8S_RBAC_ENTRA_TENANT_DOMAIN_NAME}
If the domain name is correct and verified, and you are still getting the error, please provide more information about your setup and the steps you have taken so far, so that I can assist you better. Please let me know if you have any questions and I can help you further. If this answer helps you please mark "Accept Answer" so other users can reference it.
Thank you,
James