Error : Access denied: : Missing access token for authorization. Request: MailboxService.GetThread.

[Aayesha Shrestha]

I'm trying to get messages from the Gmail Thread using this code : 

var mails = GmailApp.search('in:sent');

Logger.log(mails[0].getMessages());

But it gives this error : 

Access denied: : Missing access token for authorization. Request: MailboxService.GetThread.

In a stackoverflow question, it was mentioned that adding this scope: https://www.googleapis.com/auth/gmail.readonly  will work. But I'm still stuck with this error since a few days. 

Also, here are the scopes I've included.

"oauthScopes": [

    "https://www.googleapis.com/auth/gmail.addons.execute",

    "https://www.googleapis.com/auth/gmail.readonly",

    "https://www.googleapis.com/auth/script.external_request",

    "https://www.googleapis.com/auth/gmail.addons.current.message.action",

    "https://www.googleapis.com/auth/gmail.addons.current.action.compose",

    "https://www.googleapis.com/auth/gmail.compose",

    "https://www.googleapis.com/auth/gmail.addons.current.message.metadata",

    "https://www.googleapis.com/auth/script.scriptapp",

    "https://www.googleapis.com/auth/script.send_mail",

    "https://www.googleapis.com/auth/script.storage"

  ]

[Eric Koleda]

Are you writing a Gmail add-on, or just a regular script? If not an add-on, then remove all of those add-on-related scopes, as they are conflicting with the gmail.readonly scope. If you are writing an add-on then lost the gmail.readonly scope and set the current message access token as shown in the docs:

https://developers.google.com/apps-script/reference/gmail/gmail-app#setcurrentmessageaccesstokenaccesstoken

- Eric

[Aayesha Shrestha]

I'm working with the add-on and I cannot get the current message access token as all this has to happen without opening any message. Without opening the sent message, I have to get the mail in the sent item with index '0' i.e, the most recently sent, so that I can track the message.

[Eric Koleda]

I see. The gmail.readonly scope does everything the gmail.addons.current.message.metadata scope does (and more), so you can just remove the latter. Be aware that the gmail.readonly scope is restricted, and comes with additional policy requirements (if you want to publish your add-on for the public).

- Eric

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