Comment 8 for bug 1911228

This was fully resolved by an official SRU of the new ubuntu-advantage-tools version 27.0 to Xenial and Bionic on 2021-04-29.

The new UA client requires obtaining a contract token from https://ubuntu.com/advantage and using that global contract token on the commandline

   sudo ua attach <contract_token>
   # to enable fips if not auto-enabled by your contract
   sudo ua enable fips

The security documentation referenced has been updated since the SRU to reflect these steps if needed.
https://security-certs.docs.ubuntu.com/en/fips#manual-installation