Can't install a plugin on DHCP jail, only NAT

Hi, I just finished building my DIY NAS with the following (reusing most of the stuff from my old build):

* Ryzen 3600
* 8 GB DDR4
* Asus Prime B350M-A
* Crucial MX200 256 GB SSD
* 2 x 4 TB HDD
* Antec HCG 520W
* Fractal Node 804
* Connected to gigabit internet through ethernet

I installed TrueNAS 12 U2 with a bootable USB, so far so good... Then I configured the network like this (the last 2 DNS are the ones from my router I guess, I didn't...

Can't install a plugin on DHCP jail, only NAT