Installed Steam on a new computer. Signed in. It sent a passcode to my GMail. I signed into GMail. It wanted me to 2FA because I hadn't signed into Google on that device. It sent a notification to my phone, which I never received. I had it resend the notification twice, still nothing. Tried again with my phone's offline passcodes. Neither worked. Tried the QR code/Bluetooth connection, and that finally did it.
At least I got through in the end, but fuck, it's annoying.
i guess i should edit my post, i did actually manage to pull my private repos off it. i found out a couple weeks ago that i was still logged in with stored credentials for the github cli program. so i was able to use that to clone them. i hadn't even thought of asking them for temp access, but you're right.