· If you use the WorkflowWorkCalendarDueDate provider, work items must have valid Working Times available in the system calendar to complete the work item. To set working times, go to Organization administration > Common > Calendars > Calendars.
· Is the workflow execution account set up for workflow? Open System administration > Setup > System > System service accounts. On the System service accountsform, set an Alias and Network domain for the Workflow execution account.
· Verify that the batch job is running or if the workflow batch job is in the batch job queue.
· Check the Windows event log on the AOS.
Another reason
if 2 instances running in the same environment then change the following
in ax client configuration. create configaration with
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Configuration target- Business connector
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Create config with proper server name ,instance name & port number