Try clearing cookies and cache,and if using the app try a browser instead,and using a Pc may cure the issue,along with changing the brwoser on it to firefox or chrome.All options worth trying
If you still get no watch list look to report it to ebay here,who can pass it on to the ebay tech team https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Weekdays: 8 am-10pm
Weekends: 9 am-6pm.
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