Reply To: Prevent stacking of a coupon with other specific coupon

[Soft79]

This plugin claims to have that functionality:

https://codecanyon.net/item/woocommerce-coupon-exclusions/7721966

I never tried it, so I can’t tell how good/bad it is and I’m not sure if it will work with automatic coupons.

On the other hand we can do customization work if required.