trying to enable CONFIG_AUTOFS4_FS in the kernel for my custom machine my_mach using Yocto Project

I'm trying to enable CONFIG_AUTOFS4_FS in the kernel for my custom machine my_mach using Yocto Project, but it's not reflected in the final image.
Observe my set up:
-Base layer: meta-xxx-yyy
-Custom layer: meta-xxx-mylayer
I took this steps to try trouble shoot
-Added CONFIG_AUTOFS4_FS=y to a fragment file (frag.cfg) in
meta-xxx-mylayer/recipes-kernel/linux/files/

-Included the fragment file in linux_git.bbappend using SRC_URI += "file://frag.cfg"
-Set COMPATIBLE_MACHINE_my_mach = "my_mach" in linux_git.bbappend
-Built the kernel using bitbake linux -c cleansstate -f; bitbake linux -c configure -f; etc.
The build completes successfully.
CONFIG_AUTOFS4_FS is not set in the final image
/proc/config.gz
.
My custom layer meta-xxx-mylayer seems functional
another recipe builds rootfs successfully
.
frag.cfg is copied to a different directory than the main kernel source git.
What could be causing CONFIG_AUTOFS4_FS to not be enabled despite the fragment file?
Is the location difference between frag.cfg and the main source a potential issue?
@Middleware & OS
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