How do I fix Shopee "Selected category is mandatory to fill in size chart, please fill in the size chart id or change the category"?

Starting December 2024 Shopee started forcing all products in some categories to have size charts.

To add a size chart please follow the instructions here: https://seller.shopee.ph/edu/article/14848

Remember to set the size chart to the correct category. Once you have created a size chart to the correct category the app will automatically use that size chart when adding a new product to Shopee.