Create session by code: error

I think this is related, so adding it to this thread, but we could also start a new one. I am flabbergasted by the error from this code. Any insight?

import { sessions } from "wix-bookings-backend";
export async function createNonRecurringSessions(sched, sdate, edate) {
    let start = new Date(sdate)
    let end = new Date(edate)
    const sessionInfo = {
        scheduleId: sched,
        start: {
            timestamp: new Date(sdate)
        },
        end: {
            timestamp: new Date(edate)
        },
        type: "EVENT",
        tags: ["Blocked"]
    };

    const options = { suppressAuth: true };
    return sessions.createSession(sessionInfo, options)
        .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: {}