Ad technology providers and linked accounts

Whose ad technology provider controls are used when an Ad Manager account is linked to multiple Ad Exchange/AdSense accounts?

It depends on how the Ad Manager publisher is sending traffic.

If the Ad Manager publisher is sending traffic using:	The ad technology provider controls for this account are used
One or more of the following: “Ad Exchange” or “AdSense” type line items Programmatic Guaranteed or Preferred Deals in Ad Manager line items Open Bidding Yield Groups First Look	The Ad Manager account where the setup occurred for the line item, Open Bidding Yield Group, or First Look.
Other means, such as: Ad Exchange tags directly on the site Ad Exchange tags set up as third-party line items	The Ad Manager account whose network is assigned to the Ad Exchange account. Learn more about accounts in Ad Manager.