I am currently following the Office 365 guide (Duo Protection for Office 365 | Duo Security) to install Duo auth for 365.
I have setup DAG, AD Azure Sync etc but am having trouble getting the AD Federation portion set up. When I enter the command “Set-MsolDomainAuthentication” with all of the parameters I get the following error message back:
“You cannot remove this domain as the default domain without replacing it with another default domain”
I am unsure why it is bringing up this message as I thought the commands purpose was just to change the authentication type from Managed to Federated and apply the necessary extras.
Any assistance with this would be hugely appreciated.