Error when updating 2 to 3: Bad Request Unable to verify your data submission Followed all steps on Upgrading from Craft 2 I have my .env, db.php, general.php and index.php in place... can't find any reference of this issue.

This happens after "To complete the update, some changes must be made to your database." and clicking on "Finish Up"
I was able to fix it replacing the content of config/license.key by the word temp