So from B2, I can save the profile, but now it's the opposite situation, the field is indeed mandatory, so the message "Optional but advised, it allows you to locate on the map of the site." should no longer be visible ". And I should not be able to save my profile when no data is completed., but I can do it although the field is marked *.
I suggest, if you can do so, to force the completion of country, province and city in case the field is marked mandatory.
To oblige only the country would be useless, to oblige all the data would be excessive, you have to choose the right one here, what do you think?

In this case, the message should be, "You must at least fill in the country, province / state and city."