Hi Antoine,
We’re sorry to hear you had trouble with the adapter! We actually sent you an email with some tips. Often, the issue can be solved by gently pulling the tab towards you when inserting it, which helps ensure it’s fully and securely fitted.
We’ve tested this adapter with all official iPhone cases and many other brands, and it works as expected when inserted correctly. If it’s still giving you trouble, we’re happy to guide you through it anytime, just reach out!
Thank you for your feedback, honestly!
– Team Labo Mono