Outlook ui-less get bootstrap token

Question

hi There,

I am trying to run a ui-less Outlook web add-on but when i am running this on Windows the command :

   var ssoToken = await OfficeRuntime.auth.getAccessToken({});

is restricted to run on Outlook for windows.

Is there an option to ui-less get a bootstraptoken ? beasue it is also not possible anymore to use the dialog because that is prohibited to by design.