error -22 when subscribing to HOGP reports

[Orlin]

I have a ready hogp struct and I'm trying to subscribe to an input notification (I'm connecting to a bluetooth keyboard) and I'm getting error -22.
Here's the callback in question and the function that it's supposed to call after:

HOGP Ready callback:

static void hogp_ready(struct bt_hogp *hogp) 
{ 
    LOG_INF("The HOG profile has been created successfully. Now attempting to subscribe...");
    
    struct bt_hogp_rep_info *rep = bt_hogp_rep_find(hogp, BT_HIDS_REPORT_TYPE_INPUT, 0);

    int err = bt_hogp_rep_subscribe(hogp, rep, hogp_read_cb);
    if (err) { LOG_INF("There was an error subscribing to the hogp read report: %d", err); }

    

read callback:

static uint8_t hogp_read_cb(struct bt_hogp *hogp, struct bt_hogp_rep_info *rep, uint8_t err, const uint8_t *data)
{
    if (err) {
        LOG_ERR("Error in report notification: %d", err);
        return 0;
    }

    size_t size = bt_hogp_rep_size(rep);
    LOG_HEXDUMP_INF(data, size, "Received input report (keycodes):");
    return 0;
}

As far as I can tell, the problem is that I'm feeding the subscribe function something I shouldn't be, but everything seems correct after double-checking with the header.