Hi,
We are running into a problem with re-enabling removed ad groups. In the past both campaigns and ad groups could be re-enabled from REMOVED status by simply setting their status to ENABLED, this no longer works, as the removal seems to be permanent. Instead the API allows multiple campaigns with the same name to exist, as long as only one campaign is ENABLED or PAUSED and the rest are REMOVED.
However, this does not seem to work for Ad Groups. After setting a Ad Group status to REMOVED the status can no longer be set to ENABLED, but no other Ad Group with the same name can be created either. In essence, we are now have a number of Ad Groups that are 'locked', they cannot be re-enabled, but they can't be renamed either (although the web interface can still do this.)
We have worked around the issue by renaming ad groups prior to deleting them, but this is far from optimal. Is this a bug or is this working as intended?