However, the error message you see typically appears when the system can’t find a suitable shipping method for the customer’s location. It’s possible that the shipping zones you’ve configured don’t cover the location of the customers trying to make purchases.
Please check your shipping zones and methods to ensure they cover all the regions you want to ship to.
Additionally, are you using any plugins or thrid party services for your shipping? Could you please share a screenshot of your shipping zone and method settings? For screenshots, you may use https://snipboard.io – please follow the instructions on that page, then paste the URL in this thread.