Snapshot Replica runs forever - stuck at 10%

I am trying to set up a SnapShot Replica between 2 QNAP NAS servers.
Both run the latest update of QTS.
NAS1 = source, it shows a valid Snapshot = /snapshot:home/DataVol1 Snapshot 1.12TB 105097 Folder(s)/Files, modified Date: 2025/03/16~2025/03/16
NAS1 shows a Snapshot Replication Job:

NAS2 shows a Snapshot Vault:

It’s been syncing at 10% now for almost 48 hours. Still there are no files anywhere on NAS2.

So what is wrong here?