I’m having the same issue. I use a few apps. The shipping app I use is FBA Shipping by Bytestand. It’s been working for a year, but I’ve noticed a few customers have been notifying me of this issue now. It started a few months/weeks ago.
Same here! We use a multivendor app to deliver our shipping rates and customers seem to get this error when a coupon code is populated. Has anyone resolved this?
hey, we develop our 3rd side app for shopify customer to use that for dynamic checkout rates, if you want to hear about us send me PM, i heard of this issue from our customers, still i didnt find anything yet related to this bug