With Authy EOLing the desktop App, migrating your Data may suddenly have become rather urgent. Here are some instructions, heavily influenced by information found on this gist
First install the authy desktop app and start it
wget https://api.snapcraft.io/api/v1/snaps/download/H8ZpNgIoPyvmkgxOWw5MSzsXK1wRZiHn_18.snap