It's important to understand how Xapo sends funds on behalf of our users to ensure that any refunds you are expecting back to you truly reach your Xapo account.
All wallet or vault addresses that are displayed within your Xapo account are receive-only addresses. Xapo uses a collection of Xapo-owned bitcoin addresses in order to send funds on behalf of our users. For that reason, Xapo bitcoin sending addresses are not designed to receive bitcoin for Xapo users. Any funds sent back to Xapo sending addresses will not reach your Xapo account.