I can't expand to my 3rd island. The game says I need 6 neighbors, clearly I have that, I have 99. I don't understand the problem with this. Can anyone help explain why this is happening? Thanks in advance.

Have you bought all the available expansions on the 2nd island?

Yes I have already bought all the other expansions. This is my next expansion. I don't know how to get it with gold.

@Corinna-Risner I believe you have to purchase the islands themselves with gems. The expansions are then purchased with gold.