eBay LINK uses your eBay User ID as a way of identifying you on eBay. If you change the eBay user ID, eBay LINK will stop working.
So whilst the answer is yes you can change your eBay user ID, the connection between eBay LINK and eBay will break and we will not be able to connect to your store to update products and retrieve orders.
If you need to change your eBay user ID please submit a request to our support team so that we can co-ordinate the change between eBay LINK and eBay and ensure that your service is uninterrupted.
Please note this change can take up to 5 business days for the team responsible to action.