That was with the libgcrypt11 GnuTLS package (2.12.14-5ubuntu2).
Once I switch back to a GnuTLS with nettle then sssd works, supporting sudo.
That was with the libgcrypt11 GnuTLS package (2.12.14-5ubuntu2).
Once I switch back to a GnuTLS with nettle then sssd works, supporting sudo.