io_uring with `fio` fails on Rocky 9.3 w/kernel 5.14.0-362.18.1.el9_3.x86_64

I've tried various variations of the command:

fio --name=test --ioengine=io_uring --iodepth=64 --rw=rw --bs=4k --direct=1 --size=2G --numjobs=24 --filename=/dev/sdc

- lower queue depth - direct set to 1/0 - lower numjobs - setenforce 0 just in case SELinux was a problem but all yield:

test: (g=0): rw=rw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=64
...
fio-3.35
Starting 24 processes
fio: pid=71823, err=1/file:engines/io_uring.c:1047, func=io_queue_init, error=Operation not permitted

I have confirmed my host supports io_uring:

[root@r7525-raid tmp]# grep io_uring_setup /proc/kallsyms
ffffffffaa7d4300 t __pfx_io_uring_setup
ffffffffaa7d4310 t io_uring_setup
ffffffffaa7d43a0 T __pfx___ia32_sys_io_uring_setup
ffffffffaa7d43b0 T __ia32_sys_io_uring_setup
ffffffffaa7d4430 T __pfx___x64_sys_io_uring_setup
ffffffffaa7d4440 T __x64_sys_io_uring_setup
ffffffffaae1b3ef t io_uring_setup.cold
ffffffffac2b0180 d event_exit__io_uring_setup
ffffffffac2b0220 d event_enter__io_uring_setup
ffffffffac2b02c0 d __syscall_meta__io_uring_setup
ffffffffac2b0300 d args__io_uring_setup
ffffffffac2b0310 d types__io_uring_setup
ffffffffacabbc68 d __event_exit__io_uring_setup
ffffffffacabbc70 d __event_enter__io_uring_setup
ffffffffacabdd38 d __p_syscall_meta__io_uring_setup
ffffffffacac1cd0 d _eil_addr___ia32_sys_io_uring_setup
ffffffffacac1ce0 d _eil_addr___x64_sys_io_uring_setup

Running with libaio against the same target works without issue. I have not yet read through the code for io_queue_init. Is there a trick to getting io_uring up and running with fio? I haven't yet read through the code for io_queue_init to see exactly what is failing.