Hi @bc_99
What do you means by using AEM as a source in target? Would you please elaborate what specific issue you are seeing on A4T integration?
A4T integration lets you use Analytics reports to examine your results. If you use Analytics as the reporting source for an activity, all reporting and segmentation for that activity is based on Analytics data collection.
Kindly refer to the below A4T troubleshoot link in case you are also dealing with similar kind of issue:-
https://experienceleague.adobe.com/docs/target/using/integrate/a4t/troubleshoot-a4t/a4t-troubleshoot...