Related Questions:
Why am I getting an error for invalid Tax?
My Taxes are correct, why am I getting this error posting items?
What does invalid tax mean?
Answer:
If you get the error "The selected Menu Item has an invalid Tax" but your Taxes are mapped correctly, you can re-add the Taxes to the Menu Items and refresh Event Temple. Post the items again.
If the errors persists, please reach out to our friendly support team :)