Well, Comodo might be a 'star' IF one has direct access to it for the global cert for the domain. In this case, the moodle.example bundle mentioned in the 326457 discussion isn't present ... wasn't provided by former server admin for that domain.
Besides that, entity has some time ago standardized on Canvas so there is really no interest by the entity to assure Moodles of any version works with certs nor Androids/iPads/iPhones.
Site really used for exploration of Moodles ... not a production server ... so guess it will limp along.
Funny though ... moodle 3.3 no such issue ... it's only the moodle 3.4 ... and probably all future versions of Moodle. New app probably requires ... soooooooo .... guess it stays as is.
Thanks for the info and assitance though, Matteo!
'spirit of sharing', Ken