While foreman-maintain provides tab key Bash completion (see BZ 1620724), and /usr/bin/satellite-maintain is a symbolic link to /usr/bin/foreman-maintain, one cannot use Bash completion with satellite-maintain.
Verified on stream snap 10 Bash completion is working for satellite-maintain. Steps to Reproduce: 1) install bash-completion and run `# bash -l` Results: # satellite-maintain advanced -h maintenance-mode restore upgrade backup health packages self-upgrade content --help plugin service # satellite-maintain health check -h --help list list-tags