Cant Replicate one specific dataset

i have two truenas scale/fangtooth servers.

one has two independent pools, the other has one.

to replicate from one pool to the other on the same server, i set up a single task with each dataset selected, and that works fine.

to replicate from the main pool to the 2nd server, i set up individual tasks for each dataset (due to encryption). ONE dataset wont allow me to create a replication task; after you create the task and hit ‘save’ it just sits there and you can watch the scrolling animation, for over an hour. but it never finishes.

i have rebooted the server, no change.

any ideas? i can access the data fine, but something is wrong.