I want to get the busy slots of a user based on his google calendar.

calendar.freebusy.query({
                resource: {
                    timeMin: startTime,
                    timeMax: endTime,
                    timeZone: timeZone,
                    items: [{ id: userEmail }],
                },
            })

userEmail: The user whose busy slots I want to find out. But, After using this function, Getting the error:

[ { domain: 'global', reason: 'notFound' } ]

Note: I have used some another email ID for the configuration of google calendar OAuth.

Kindly help me to solve this issue.