I know there are already so many posts on this one but I wanna know if this is fixed in version 2.2.9?
We're currently on 2.2.9 and figured this issue today. So,
Purchasing an order as a guest, there is no problem purchasing the order.
If I'm signed in with same billing and shipping info and try to check out
a message appears and disappears quickly :"Unable to save shipping information. Please check input data"
We tried to delete the account and reset same info for a particular customer and system allowed to checkout flawlessly.
Also, for some customers, there isn't an issue to order.
Wierd, can someone help me with this, please?
Did you checked your server logs to try to find a a clue?
Also, this isn't a solution but maybe you could check if one of the comments here can help: https://github.com/magento/magento2/issues/11185