Updating List fails and returns 'List Item not found' using workflow

Using Sharepoint Designer, I have created a workflow that is initiated when a new item is created.  It  has two steps:

Step 1:  Create item in Task list - Sets a variable (TaskID) to the value of List A item ID and then creates a item in a task list.  The Task list has a field in it for the TaskID.  (The reason I did this was because when the status field is updated in List A,  I want the status of the task to be updated to closed) This part of the workflow works great, when I add a new item into the List A and click submit a new item is created with all the proper values in the Task list, including the TaskID which associates it with th

Step 2: Update Task - Waits for Status in List A to not equal Open then updates Task list to Closed

Step 2 is not working.  When I update the Status in List A to not = open the Task list, more specifically the item with the correct TaskID stays with the same status of 'In Progress'.  When I look at the Workflow Status of List A I get the following results:

Error updating a list item - List item not found

The reason I created a variable in step 1 and set it to the List item ID and created a field for it in the Task list was so that it could a specific item could be uniquely identified and updated.

From the 'Update List Item' box:

Field:  Status
Value:  Completed

Find the List Item:

Field:  Open MS Support Calls:  TaskID
Value:   Variable:  TaskID (generated when a new item is created)

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