not able to use chat sdk

Hi I want to use Chat SDK but not able to get account key.

https://developer.zendesk.com/documentation/classic-web-widget-sdks/chat-sdk-v2/ios/quick-start-chat-sdk-ios/ 

I this its saying that 

In the Chat dashboard, click your profile icon in the upper right, then select Check Connection.

But https://support.zendesk.com/hc/en-us/articles/4408825772698-How-do-I-find-my-Chat-Account-Key

in this post its saying that 

As noted in this article:
 
"The Chat Account Key is not visible for accounts using messaging. The Account Key is not necessary for any integrations, plugins, or mobile app development under the messaging experience".
 
If you still need it, you can try to disable messaging and see if it will show up. For reference, please see this article: Disabling messaging for web and mobile channels.
 
I hope this helps. Thank you!
 

But