FSM - On the mobile agent app getting error as (Agent.NowAPIError error 4.)

[Asiya1]

On the Inventory when Parts to drop off screen opened getting error as 'The operation couldn't be completed (Agent.NowAPIError error 4.)' Please suggest how to resolve the issue.

[BrownBear]

my customer is on Xanadu patch 7 so I don't think that's the issue here but could be.