How to make AI targetLocation of another AI?

First: without specifying a Tag both the “Actor Has Tag” and the branch are doing nothing there.
Is there only one friendly? If so, then use “Get Actor of Class” and remove the foreach loop.

In the lower corner of the right side of the behaviour tree, where the keys are, you should be able to see the value of the different keys. Does the TargetLocation have a valid and correct value?

From your behaviour tree, there is the “FindFriendly” but I don’t see any Move node. How does the character move?