Hello,
We are migrating from on premise Exchange 2010 to Office 365 (exchange online) and the platform that we are using to do the migration basically connects to the mailboxes and makes a copy of email so that we don't have any downtime.
In order to connect, the software uses the EWS login which is something like https://domain/ews/exchange.asmx
We can connect and we get a login box but when we enter any user's credentials, it will just go to a blank page and thus the software cannot do anything either.
Anyone have any clues as to what could be happening with this authentication and where to look???