Occasionally a withdrawal is returned by the receiving bank. By far the most common reason is that the bank account information does not exactly match the information you provided during identity verification.
Before retrying, double-check that the name and account details on your bank account match your verified identity details exactly. If a withdrawal was returned, check your Trove balance to confirm the funds have reappeared, then start a new withdrawal with the corrected details. If you need help, contact support.