Portainer - Multiple macvlans on same interface

Nowhere I have searched, nor any of the videos I have watched, mentions about multiple macvlans, or even any notes of requirements or limitations. Whenever I try to setup a second macvlan, I get an error saying “network dm-xxxxxx” is already using that interface.

My question is if it is possible to have multiple macvlans pointing to different subnets on the same ethernet interface?

I am using an Intel NUC Extreme. Only one of the 2 ethernet ports appear to be detected. That one is the 2.5Gbps Intel. The 10Gbps Marvell is the missing one. Being an Intel NUC, I would have thought (& hoped) both would have been Intel interfaces.

Output of lspci -nn | grep -i net:
00:14.3 Network controller [0280]: Intel Corporation Device [8086:7af0] (rev 11)
6d:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I225-LM [8086:15f2] (rev 03)
6e:00.0 Ethernet controller [0200]: Aquantia Corp. Device [1d6a:14c0] (rev 03)*

*Note: Aquantia was bought out by Marvell, and on the Intel website, it says the interface is Marvell.

My Pi-Hole, router, & UniFi are on one VLAN, while my computers are on another.

Thank you