Email Markup It does not show the button in the subject line on gsuite, in Gmail is working : I did Email Markup tests in Gmail with positive results, but in gsuite gmail (company) the same script does not show the button in the subject line.

I do not know if it is related, but before setting up Dkim registration in Gsuite, we recieve external emails with Email Markup, will any additional permission, or additional code, be needed?

I used the example code of the following link:
https://developers.google.com/gmail/markup/apps-script-tutorial