Flash won't work

good day,

have you tried setting the camera on "flash mode"? usually it has a lightning symbol that specifies that you are in flash mode. you can also set it on auto-flash where it automatically detects the level of light and uses flash when necessary.

however, if you have already tried the suggestions above, you may have a busted flash. in this case, you can approach your seller or the nearest service center of fuji.

i hope this will help