Can not start Webinar zoom

Dear all,

I follow this post: Meeting SDK - web - client view - Webinars
But it’s not working correctly for me

client.join({
sdkKey: sdkKey,
signature: signature, // role in SDK signature needs to be 1
meetingNumber: meetingNumber,
password: password,
userName: userName,
userEmail: userEmail, // userEmail property required
zak: zakToken // the host’s ZAK token
})