WIX Booking: createSession() error "entity_not_found"

I am flabbergasted by the error from this code. Any insight? I am trying to create a session blocking the schedule of a resource. I am using the _id from the Schedule database. The error message seems to say that the _id of the schedule I am trying to assign a session to is "entity_not_found" I wonder if I'm using the wrong id field? I have tried switching to "WORKING_HOURS" for the type field, and multiple scheduleIds. I am lost. PLEASE HELP!

import wixData from 'wix-data';
import { sessions } from "wix-bookings-backend";

let sched = "b263b6c9-efa9-407e-b096-114512ab2d03"

export async function createNonRecurringSessions(sched, sdate, edate) {
    const sessionInfo = {
        scheduleId: sched,
        start: {
            timestamp: new Date(sdate)
        },
        end: {
            timestamp: new Date(edate)
        },
        type: "EVENT",
        tags: ["Blocked"]
    };

    const options2 = { suppressAuth: true };
    return sessions.createSession(sessionInfo, options2)
        .then((session) => {
            return session;
        })
        .catch((error) => {
            console.error('Failed to create session:', error);
        });
}




Failed to create session: 

message: 

entity_not_found, 
details: {
    "entity":"schedule",
    "scheduleId":"b263b6c9-efa9-407e-b096-114512ab2d03",
    "targetDate":"",
    "scheduleVersion":""}
    : Not Found

details: 
  
    applicationError:     
        description: Not Found     
        code: NOT_FOUND     
        data: {}