Why can't some customers check out with domestic shipping?

[YarnBadger]

I have had 6 people contact me in the last week to say they’re getting the following message when they choose domestic shipping:

This order can’t be shipped to the address you entered.

whils I still have some domestic customers successfully checking out. I’m concerned I’ve lost sales over the last week or two I’ve not changed my shipping profiles or anything.

[kaalTechGeeks]

Hi @YarnBadger, 
The customers on the checkout page only get this error message when the seller (In this case you) has not setup shipping rates for the area to which the customers had entered the address. 
So I would suggest you to recheck your shipping rates on your store and add the shipping rates to the region which your customers belong. That will fix this issue. 
If you need more help do let me know, I will be glad to help. 
Thanks