To migrate your Biomes, you first need to grant permission to the Biomes contract to transfer your tokens.
Why does the contract need this permission?
When migrating a Biome, the contract is:
You need to migrate each of your Biomes.
Click on the button "Migrate" and accept the transaction (free + gas cost).
Once the transaction is complete, it migh take some time to see the switch from the Old Biomes to the New Biomes sections. If you have any doubts, check your transactions or our OpenSea collection.