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Hi @magou14,
Thanks for writing in. Are there any error logs in your php error log?
Is WooCommerce up to date?
Would be great if you could share a bit more info to help us debug.
Hi @magou14,
Could you please check if you have enabled the use of coupon codes at WooCommerce > Settings > General tab like this https://snipboard.io/aHmhCn.jpg?