If you cannot manually add the tracking as this was also a change of postal service, contact eBay Customer Services they may be able to do this for you.
If it's not possible, then with no tracking your payout will be held for 14 days.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@d.bourne13