We didn’t found the origin of the problem, and I can’t reproduce it!
We could try to manually re-join the domain… First, leave it:
realm leave compu-max.lan
Some clean ups:
systemctl stop sssd
find /var/lib/sss/ -name '*.ldb' -delete
> /etc/sssd/sssd.conf
systemctl stop realmd
signal-event nethserver-dnsmasq-save
Join it again
realm join compu-max.lan
…at prompt, type the administrator password, then
signal-event nethserver-sssd-save