Hi, Regarding this specific issue, I used a patch from Fedora to change the default server URL from https://vagrantcloud.com to https://vagrantcloud.com/api/v2/vagrant.
I made uploads to unstable (2.3.7+git20230731.5fc64cde+dfsg-3) and stable(-proposed-updates) (2.3.4+dfsg-1+deb12u1). Note that if you have downloaded boxes locally in ~/.vagrant.d/boxes/ (which happens transparently when you 'vagrant up'), those boxes still point to the old URL. You can remove those local copies with (for example) 'vagrant box remove debian/bookworm64 --all'. This is just a workaround but this buys us some time. Lucas
