unassigning the eld In Encompass
Go to Settings > Vehicles tab > Encompass ELD Settings section > Connected Device List

Hover over the ELD in the list and click Unassign ELD.

Confirm that you would like to Unassign that ELD from that unit.

Now that it has been unassigned, make sure that the vehicle that the ELD is moving into has been added to Encompass. If the vehicle has not already been added, go to Vehicles > List > Add New. See Add a Unit/Vehicle for more information.
If the vehicle has already been added, ensure that it does not already have an ELD assigned to it.