I had to leave.. but I'm back...
Continuing with the "http" to "https" changes required... also:
At moodle/badges/lib/backpacklib.php, line: 33.
At moodle/lib/badgeslib.php, lines: 1301 (a comment line), 1309.
At moodle/lang/en/badges.php, lines: 82, 209, 229, 344.
Cheers!