Photos stopped syncing with my photo stream
Photos stopped syncing with my photo stream sometime in 2019 or 2020 (there are a few random photos from 2020). I had a Macbook Air from 2013 and did not want to bother with trying to fix the issue, so I ignored it. I replace my computer a few weeks ago with a Macbook Air with the M1 chip. Photos on my new computer worked great and when I would take a pic on my iPhone, it would (eventually) show up on my computer, just as I wanted.
But I finally got around to migrating my data from my old computer to my new computer, and Photos is broken again. I'm back to only a couple random photos from 2020 and none of the photos that showed up before I migrated my data.
Any ideas how to fix Photos? My preferences are set to My Photo Stream and not iCloud Photos. My Photo Stream tab is just completely empty.
MacBook Air 13″, macOS 11.4