WIP: rejecting unknown user tokens
Problem context: https://git.happy-dev.fr/startinblox/applications/sib-app/issues/287#note_56199
Solution being implemented: https://git.happy-dev.fr/startinblox/applications/sib-app/issues/287#note_56399
Problem context: https://git.happy-dev.fr/startinblox/applications/sib-app/issues/287#note_56199
Solution being implemented: https://git.happy-dev.fr/startinblox/applications/sib-app/issues/287#note_56399