Why am I seeing the error 'Tags may only contain letters, digits, hyphens, single quotes, and spaces or underscores' when publishing my products?

Why am I seeing the error 'Tags may only contain letters, digits, hyphens, single quotes, and spaces or underscores' when publishing my products?

Etsy restricts the use of special characters or symbols in product tags. Tags can only include letters, digits, hyphens, single quotes, spaces, or underscores. To resolve this error, update your product tags on Shopify to comply with Etsy's guidelines, then upload the products to Etsy from the app.