I am pretty sure that is FreePBX, not Asterisk. Can you tell us in which configuration file this appears (several files have parameter with this name)? Can you also provide the Asterisk log message when it rejects the configuration file?
If this only appears on a web interface, it is definitely not Asterisk, as Asterisk has no native web interface.
Incidentally, on a system that is capable of making toll charges, weak device secrets or AMI secrets are an extremely bad idea.
Doing a quick Google, it does appear that FreePBX has a weak password detection module https://wiki.freepbx.org/display/FPG/Weak+Password+Detection Whilst that article may answer your question, please note that this is the wrong forum for FreePBX, and I know no more than Google does. FreePBX’s peer support forum is https://community.freepbx.org/