There seems to be no direct way to transmit ad units. You should contact support if they can help you.
Go with creating new ad units as a last option. It will not immediately transfer all traffic to the new account, and your income will continue to be divided between the two accounts until all users change the version of the application containing the new ad units. This is almost impossible to accomplish in a short amount of time.
You should always use the mediation service. Thus, you can easily switch between ad units without waiting for users to update the application only to change the ad unit.
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