Welcome to FBX and its forum!
Thanks for the feedback.
As it’s “initial setup” unfortunately it has to be that way.
During your first time connection to FBX, you wont have configured your FBX for secure connection yet.
Once your setup completes (with your choice of dynamicDNS, static IP, etc.), FBX will guide you to getting you LetsEncrypt certificate. From there on all your connections will be secure.