When I select “Request Batch Approval” from the Action Board no record of the expected batch appears. However, the batch is visible from the Navigation pane Batch Status view and can be sent for approval from there. Why is the batch not visible from the Action Board request view?

As of this publication (Dec. 2024/Build x96) there is a known issue when the same Batch ID is used for both payment batches (computer checks) and payables transactions (invoice batches). When this is the case the workaround is to create a unique Batch ID in order to be able to request approval from the Action Board.
 
Note:  The fix will be included in a future build release to be announced via release notes.