Thanks for reporting.
I'm closing this after your comment. I strongly suspect the problem was
that focal wasn't found in the list of possible Ubuntu releases.
Whenever a new developmen cycle starts, the new code name needs to be
added in a couple of places and this can sometimes take a few days.
** Changed in: software-properties (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1849835
Title:
add-apt-repository does not work in focal
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