Replication failed - no snapshots for incremental changes

[atlantic]

I've transferred datasets on the same system using an intermediary 16TB drive as l needed to include all of the original 8TB disks in the new pool I was creating. Total about 13TB of data. There were some issues doing this in the GUI (I can't recall what now) so ssh'd in and ran:

zfs send -R oldpool1@snap-now | pv | zfs recv -F interpool/Backup

then after exporting the old pools and creating the new unified pool (7 disk Z2)

zfs send -R interpool@snap-now | pv | zfs recv -F bigpool/Backup

But when I try to recreate the old backup replication tasks to bigpool I get this error:

Destination dataset does not contain any snapshots that can be used as a basis for the incremental changes in the snapshots being sent. The snapshots in the destination dataset will be deleted and the replication will begin with a complete initial copy.

I checked the intermediate and the final datasets had snapshots and in Windows there were previous versions visible on the shared folders. Where have I messed up?

 

[atlantic]

Can anyone shed any light on why the copy dataset cannot be incrementally updated any more?