Ok, deleted everything in /root/certs, restarted netmaker (docker-compose restart) and ran netclient pull

root@testmaskin:~# netclient pull -n test --vvv
[netclient] 2022-04-28 11:56:49 waiting for interface...
[netclient] 2022-04-28 11:56:49 interface ready - netclient.. ENGAGE
[netclient] 2022-04-28 11:56:49 register at https://api.nm.129-151-201-102.nip.io:443/api/server/register
[netclient] 2022-04-28 11:56:49 certificates/key saved
[netclient] 2022-04-28 11:56:50 restarting netclient.service
[netclient] 2022-04-28 11:56:51 reset network and peer configs
[netclient] 2022-04-28 11:56:51 reset network and peer configs
[netclient] 2022-04-28 11:56:51 success

root@testmaskin:~# ll /root/certs/
total 8
drwxr-xr-x 2 1883 1883 4096 Apr 28 11:54 ./
drwx------ 6 root root 4096 Apr 27 22:28 ../