Tried a new box but it was incompatible with NBase-T!

I have attempted to use a system based on a SuperMicro X10SLH-N6-ST031 motherboard, but it was confirmed only after I installed pfSense 6.20 on it that it was incompatible with the “multi-gigabit” NBase-T standard that AT&T is using for it’s copper RJ45 handoff.   It only wanted to connect at either 10G or 1G, and since I didn’t have anything in the 10G range, it stuck to 1G, which was no better than my existing VM of pfSense.    But, that was entirely my bad for not asking the seller if it was compatible, so I’ll own this failure.