Lvl food storage

I have 4food storages on lvl 20 and cant lvl 1of them to next lvl, i have 5 iron st. on 20.lvl too and lvld 1of them to next lvl. What2do?

Have you tried to click on convert, not upgrade?
Is your Stronghold on Lvl 21?


Thx i forgot i need to use convert instead of upgrade. Case closed :blush:

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