angularjs - Outlook App - ADAL Authentication - AADSTS90056: This endpoint only accepts POST requests -

i'm working on outlook add-in authenticates user against azure ad , runs queries against sharepoint online sites. app uses angularjs , makes use of adal.js , adal-angular.js libraries conduct authentication process. app works within browser, fails during authentication process when used through windows version of outlook.

once user inputs username , password within add-in in outlook (windows), , internet explorer window pops message below:

aadsts90056: endpoint accepts post requests.

screenshot of error

has encountered issue? i've followed office dev tutorials (below) letter, still no luck...

https://github.com/officedev/o365-angular-gettingstarted