I would contact Adobe Customer Care to see if there is anything they can do to transfer, however this post states its not possible to transfer Adobe Stock licensing. If you are an Enterprise customer, have your admin file a support ticket via the Admin Console. If you are an individual account, contact customer care via the chat pod on Adobe.com (type Agent to get a real person) or reach out via X to adobecare
https://community.adobe.com/t5/stock-discussions/how-to-legally-transfer-an-adobe-stock-image-license-to-a-client/m-p/9773465
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