I recently bought a couple of A64-LTS boards from the Pine Store, but I couldn't get the official Armbian images to boot on them. https://www.armbian.com/pine64/
I could, however, get Manjaro to boot on them, and when I created an SD card with U-Boot from the Manjaro SD card, and the partition from the Armbian (Bullseye CLI) image, it booted into Armbian.
I noticed, though, that Manjaro distinguishes between the Pine A64(+) and the Pine A64-LTS. Tow-boot also makes the same distinction. So I wondered if maybe Armbian wasn't booting on my A64-LTS boards because it wasn't making that distinction, but it should be.
(I also noticed that the headphone jack and ethernet port aren't working properly on Armbian, though they do work on Manjaro, but perhaps it's best to focus first on getting an official Armbian image to boot on the A64-LTS.)
Here's the output of `armbianmonitor -U`: http://paste.debian.net/1266079