Have you ever found it frustrating that you can never reuse an AdGroup name after removing the AdGroup, since a removed AdGroup cannot be modified? We have awesome news for you!

Now, AdGroupService doesn’t consider REMOVED AdGroup names when verifying that an AdGroup name is unique within a Campaign. If an AdGroup is in a REMOVED state, then the name of that AdGroup can be reused. This is already the case for Campaigns, and we’ve extended this relaxation of constraints to AdGroups.

If you have questions or need clarification, visit us on the AdWords API Forum or our Google+ page.

Nadine Sundquist, AdWords API Team

Source: Google Ads Developer Blog