# Can not start Webinar zoom **URL:** \ **Category:** Web\ **Created:** [June 29, 2023, 4:48pm UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079 "2023-06-29T16:48:48Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![tuanthinhit](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tuanthinhit/32/44109_2.png) [@tuanthinhit](https://devforum.zoom.us/u/tuanthinhit)\ **Post date:** [June 29, 2023, 4:48pm UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/1 "2023-06-29T16:48:48Z")
Hi all, The documentation about initiating a webinar is not very clear. I tried but still can’t start the webinar zoom. I ran the constructor successfully and passed the parameters: `meetingNumber, password, sdkKey, sdkSecret` to the join function but I still can’t access the webinar zoom. - Can you please help me to solve this problem? Thank you in advance. Best regards, John ---
**Author:** ![tuanthinhit](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tuanthinhit/32/44109_2.png) [@tuanthinhit](https://devforum.zoom.us/u/tuanthinhit)\ **Post date:** [June 29, 2023, 5:06pm UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/2 "2023-06-29T17:06:07Z")
Dear all, I follow this post: [Meeting SDK - web - client view - Webinars](https://developers.zoom.us/docs/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 }) ![image](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/0/a/0aab2b158b3d029223311f377a778635f54267d4.png) ---
**Author:** ![chunsiong.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/chunsiong.zoom/32/35488_2.png) [@chunsiong.zoom](https://devforum.zoom.us/u/chunsiong.zoom)\ **Post date:** [July 1, 2023, 11:46am UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/3 "2023-07-01T11:46:02Z")
Here’s some common checklist 1. Have you first scheduled a webinar? 2. Do you have a sample of the JWT token used? 3. For the JWT token creation in step 2, did you use the appID and app Secret from a Meeting SDK app type? 4. For the zak token, did you use oauth or s2s oauth to get the host’s zak token ---
**Author:** ![tuanthinhit](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tuanthinhit/32/44109_2.png) [@tuanthinhit](https://devforum.zoom.us/u/tuanthinhit)\ **Post date:** [July 2, 2023, 12:07pm UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/4 "2023-07-02T12:07:06Z")
Hi @chunsiong.zoom Thank you for your reply 1. Have you first scheduled a webinar? =\> Yes. i have 2. Do you have a sample of the JWT token used? =\> Yes. i have 3. For the JWT token creation in step 2, did you use the appID and app Secret from a Meeting SDK app type? =\> Yes. i use that info 4. For the zak token, did you use oauth or s2s oauth to get the host’s zak token =\> I using zak token via JWT generate. I using this API to generate zak token: {{baseUrl}}/users/me/zak?type=zak Best regards, John ---
**Author:** ![chunsiong.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/chunsiong.zoom/32/35488_2.png) [@chunsiong.zoom](https://devforum.zoom.us/u/chunsiong.zoom)\ **Post date:** [July 2, 2023, 1:28pm UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/5 "2023-07-02T13:28:51Z")
Could you share a your JWT token? ---
**Author:** ![chunsiong.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/chunsiong.zoom/32/35488_2.png) [@chunsiong.zoom](https://devforum.zoom.us/u/chunsiong.zoom)\ **Post date:** [July 3, 2023, 1:22am UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/6 "2023-07-03T01:22:36Z")
could you try this endpoint for the zak token retrieval as well? {{baseUrl}}/users/:userId/token?type=zak&ttl=7200 ---
**Author:** ![tuanthinhit](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tuanthinhit/32/44109_2.png) [@tuanthinhit](https://devforum.zoom.us/u/tuanthinhit)\ **Post date:** [July 4, 2023, 6:24am UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/8 "2023-07-04T06:24:49Z")
Dear @chunsiong.zoom This is my JWT token “eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJhdWQiOm51bGwsImlzcyI6Il9WWnhGOGpPUlFTek11QUVYNXVrc1EiLCJleHAiOjI1NTQzOTA4MDAsImlhdCI6MTY4ODAyNDkwN30.I5sOIEcoPz4nQPZ55FWifOY0I7MPMx2d-MLbMokFIlQ” Best regards, John ---
**Author:** ![chunsiong.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/chunsiong.zoom/32/35488_2.png) [@chunsiong.zoom](https://devforum.zoom.us/u/chunsiong.zoom)\ **Post date:** [July 4, 2023, 7:14am UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/9 "2023-07-04T07:14:27Z")
@tuanthinhit , where did you get this JWT token from? It is not a valid one. The fields are incorrect. This might be highly likely the cause of your issue. Here’s a guide on how to generate the JWT token > **[How to create a sample JWT for the Meeting SDK](https://devsupport.zoom.us/hc/en-us/articles/360059893552-How-to-create-a-sample-JWT-for-the-Meeting-SDK)** > > The Zoom Meeting SDK uses JWT Web Tokens for authentication. The token is generated by the developer using the developer's SDK Key and Secret. This tutorial will guide you through creating a sample... ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\ **Post date:** [August 3, 2023, 5:14pm UTC](https://devforum.zoom.us/t/can-not-start-webinar-zoom/91079/10 "2023-08-03T17:14:52Z")
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