Hello. I bought a gold pass. But the fourth place is closed for eggs. Why?

I’m having the same issue, I have a Golden Pass but the 4th egg slot won’t unlock despite restarting the game

So I have literally just found the answer within the game. You have to PAY EXTRA for it!! so here in the UK not only do you pay a minimum of £19.99 for the Golden season pass you are now asked to pay an extra £4.99 on top for the extra slot