Did you want an answer that fixes the problem? Enter your area code/ dialing
location and you will not ever have to deal with it again (unless you
reformat). I guarantee it. Microsoft does not assume anything about you - it’s
a holdover from the days when almost everyone used dialup... while the
number of dialup users have dropped, people still use outlook for dialing
voice calls and a surprising number of people are still in the stone age and
use dialup as their main internet connection method.