How does one get a steam key after purchasing game on Itch.io?
Viewing post in Embark is on Steam Early Access on the 18th of April! comments
Here is a guide from another game: https://dapperpenguinstudios.itch.io/rise-of-industry/devlog/21080/how-to-get-a-steam-key-from-your-itchio-purchase
Also I think you have to be logged into itch.io. Let me know if this doesn't help.