An additional note for anyone that still cannot run this update even with the command: You can still just install the update manually by removing the SD card from the Pi, plug it into your computer, and install the latest version using Etcher.
That’s what I ended up doing because nothing else worked for me. Thankfully I had Umbrel OS installed separately from my external SSD storage so everything came back online with no issue after manually installing the OS using Etcher.