When the data is refreshed to a sandbox environment, retail retargeting job fails if the customer is using RSSU. For the re targeting job to go through, one should remove all Retail channel data groups and keep only the default channel data group. The job will succeeded only when all distribution jobs are applied in the retail DB.

The current Retail Redeployment package was released before RSSU was introduced and I assume it doesn't support an environment with RSSU.
Under Review