Outlook plugin authentication failures

Hi guys,

Having an issue with the outlook plugin authenticating. I have installed the plugin and pointed it to my nextcloud server URL, I try to authenticate using my AD username and password which allows access via both the Web UI and the IOS app but get greeted with the error stating that the information provided is incorrect.

URL is correct and using valid credentials so a little bit stumped, any advice would be much appreciated.

Cheers
Rob