Yes.
As advised, Ebay can no longer change or add tracking if you don't send itens individually with Simple Delivery.
They are suggesting sellers contact buyers and give them the correct tracking.
Should the buyer open a case for non-delivery, you would have to add your own tracking to the case.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)