When authenticating receive 403 disallowed_useragent

This is a security setting that is applied on the GMAIL account level, you will need to engage the mail administrator. 

There appear to be two solutions / workarounds:

  1. Use webview to change theUserAgent - i.e. the browser
  2. Provide messaging when going to the Authentication page with "Built in application browsers, such as Facebook / Pinterest, Instagram" are not supported

Please see https://stackoverflow.com/questions/65353812/web-google-auth-workaround-for-403-disallowed-useragent-exists  more information. 

 

This is not something Nylas support can assist you with.

 

References:

https://support.microsoft.com/en-us/office/i-see-error-403-or-disallowed-useragent-and-a-google-error-what-s-up-9ffb0b43-2a8b-4d36-80b8-ad8e460fb786 

 

Updated

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