I accidently licensed photo #503392485, how do I unlicense it?
You can't unlicense. You need to delete the files from your computer and contact Adobe support for a replacement license point. Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled! If the chat window fails to open, or is non-responsive, use a different device to start the interaction.
Support phone numbers may be found here: https://helpx.adobe.com/contact/phone.html. Please note that phone charges may apply.
(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here
I have verified that you have licensed asset ID:503392485 and have granted you a replacement license. Please delete asset from any downloads or library at your end.
Hope this helps !!!