MS Teams Setup won't work

Hi Guys! I've tried setting up a MS Teams + VF integration following the repo from @NiKo https://github.com/voiceflow-gallagan/api-integration-msteams , but I can't seem to get it work. I am 100% sure I've setup the right AppId and the AppPassword but I am constantly getting a 400. Anyone who can help me out?

{
"message": "The bot's Microsoft App ID or Microsoft App Password is incorrect.",
"status": 400
}