Since your Moodle is a Bitnami (one off from typical Moodle), best resource for issues *might* be:
https://community.bitnami.com/c/moodle?no_subcategories=false&page=6
Might check there first ... even if someone there might link back to Moodle FAQ's/docs/etc. Comment: guess that's the 'price' one pays for 'easy install' (tip of iceburg) and a AMP stack that's once removed from 'native' AMP stacks.
'SoS', Ken