Hello @fierceknockouts
Thank you for reaching out to us, we are here to help.
The most common cause for this to occur, is when you have assigned a tax class to a product that is not completely configured. You can check this by going to the product, finding out what tax class it uses, then go to the WooCommerce > Settings > Tax and check the tax class tab, to see if there is any entry populated with the tax class rates. If it is empty, you need to press “Insert row” and add any details that are required.
If this is not the cause of your problem, you might want to share some screenshot of all settings that you use and details of your products. Maybe it is caused by something else, but we need to have a look to find out what that could be. If you don’t feel comfortable sharing those details on a public forum, please open a ticket with our service desk. You can find the instruction for this here: https://zettle.inpsyde.com/docs/request-support/
(please add the URL of this thread in the ticket as well)
Let me know if this helped you resolve the issue or if you require additional support.
Kind regards,
Joost