In audience manager, is it possible to enrich and match 1st party data (containing PII data) with 2nd or 3rd party data? If yes, where can they be used (through Campaign only or also via DSP's)?
AAM does not collect PII. We can create segments using all 1st, 2nd and 3rd party data, and can send those to DSPs.
Even when integrating with Adobe campaign we collect hashed email addresses and apply data export control and labels for PII.