MAX HD4 MBX 5G not seen in SFC portal to add data

[Moved this post to the correct category]

I have a mix of BR2, BR1 5G, and MBX 5G devices. I recently wanted to enable SFC 5G/LTE on them so I went to the portal to add them into the pool. All of my BR1/BR2 devices show but none of my MBX devices show as available. Is there something I’m missing (separate pool required for MBX, limitation of hardware, etc.)? All devices are on 8.3 or 8.4.