[Freeipa-users] Ensure that IPA user can be resolved upon SystemD-Unit start

I do have a sytemd service unit that uses an IPA used. However, upon reboot it seems that that particular IPA user is not available upon start of that particular systemd service. Using "After=sssd.service" is not sufficient. What would you recommend in this case? (I am looking for a reliable systemd solution and do not want to rely on a script checking for a particular user with getent for example) Cheers, Ronald