Jeffrey, thank you for your input.
I successfully managed the migration using journeys by following these steps:
- Migrated from the existing UCS (v12) to the r2600 tenant (v15).
- Then migrated from the r2600 tenant (v15) to the r2600 tenant (v17).
Initially, I was attempting the following procedure:
- Migrated from the existing UCS (v12) to a UCS (v15).
- Then from UCS (v15) to r2600 tenant (v17).
I realize now that the mistake in my initial approach was trying to migrate in two steps while the UCS content remained at v12. Your advice was a great help!