I had the same problem on my laptop not being able to get into the bios. Turns out the reason is that the f-keys (f-1 to f-12) where not registered as such on boot.
They are also the keys for volume and brightness etc. So when I pressed f-11 on boot it registered it as "Brightness up" and not "f-11".
The solution was to press "fn" + "f-11". Then it registered as the correct key.
You have the option to toggle the default on that. So that you press f-11 and it registers it as such and "brightness up" is "fn" + "f-11).
For me that toggle was "fn" + "esc". There also was a lock symbol on ESC so if ESC doesn't work search for the key which has a lock on it.
That toggle was also an option in the bios.
So yeah, wasted an embarrassing amount of time figuring that out.