During the write stage of a workflow for creating users in the target AD - no users are being created and the workflow logs are showing the following errors.
Write: The server cannot handle directory requests.
Write: Directory Operation Error (UnwillingToPerform): 0000052D: SvcErr: DSID-031A1254, problem 5003 (WILL_NOT_PERFORM), data 0
This is caused by the password setup in your workflow template not matching the target AD's password policy.
Confirm what your target domain password policy is and then amend the template to use a more complex password that matches the target domain policy.

When this error occurs, there are typically issues with the default password being used in the Workflow Template for the objects being synchronized. Ensure the default password meets the policy requirements within Active Directory. If any portion of the name of the object is contained within the default password, it will likely fail.
As an example:
Write: The server cannot handle directory requests.
Write: Directory Operation Error (UnwillingToPerform): 0000052D: SvcErr: DSID-031A1254, problem 5003 (WILL_NOT_PERFORM), data 0