EOS R7 won't focus

[Kayeb]

I recently purchased the Canon EOS R7 and EL10 flash.  I took it on vacation and was in some caverns and it would not focus.  I also had the camera on Program. Why would it not focus?  Did I not have it set right?  It focused fine outside the caverns.

[shadowsports]

Greetings,

In some shooting modes, the shutter will not release if focus cannot be achieved.  Shooting inside a dark cave is an example of this.  In this case, manual focus with flash might have helped.