Can't install arm64 package

I'm trying to install some arm64 libs for cross compiling

sudo apt-get install uuid-dev:arm64

returns

E: Unable to locate package uuid-dev:arm64

despite having run

sudo dpkg --add-architecture arm64
sudo apt-get update

You can see that the package exists for arm64, but it's not finding it somehow.

There are no download mirrors listed at Download Page for uuid-dev_2.27.1-6ubuntu3_arm64.deb on machines. The uuid-dev package for arm64 architecture appears to be unavailable from the official Ubuntu uuid-dev package download webpages for all currently supported versions of Ubuntu.