Purchase Code invalid (Arrowthemes)

I bought the template “Sandal” on ThemeForest - and received a “Item Purchase Code” - but when creating an account at “arrowtheme” (Creator) they say the Purchase Code is invalid.

Why?

The pruchase was made:
2019-10-03 14:24:12 UTC

Hi

Please contact Item Author to get item support How to Contact your purchased Item Author and let them know. You can post comments in your purchased item comments. Item author will be happy to assist you.

Thanks