When configuring Adobe Target within AEM and entering the email ID & password associated with the Target account, an error is observed "Connection failed for following reasons".
For the Target and AEM integration, the credentials of a user provided from Target Standard/Premium do not work.
A user name and password of the user that exists in the Target classic back end is required. Contact Target support at email@example.com if no user exists.
The way the integration works requires the credentials of the Target classic back end. Even though you are on Target premium, it still connects to Classic. The engineering/product teams are working on updating to the new APIS - but there is no date for this. Until this fix, the integration works as usual.