UPS is retiring its legacy (XML-based) APIs, in favor of using newer OAuth-based APIs.
Boxify has long supported the use of UPS's newer API to obtain shipping rates. And we have notified by email those users who had connected Boxify to UPS's legacy API that they should connect Boxify with UPS's new API.
You may be reading this to learn how to make this update. It's easy. Just follow the instructions described here.
Dealing with Problems Authenticating at UPS.com
One possible problem would be that you set Boxify to display your account-specific (negotiated) rates but do not, in fact, have negotiated rates on your UPS account. You can check that by logging in at UPS.com and using the Time and Cost Calculator there to price a shipment. When you do that, indicate that you'll be prepaying on your account. That will show whether you have negotiated rates on your UPS account. If you don't have negotiated rates on your UPS account, set the rate tier for UPS in Boxify to either "Retail rates" or "Daily rates" when you are authenticating Boxify at UPS.com, which will then allow this to work.
Another possible problem is that you set Boxify to display UPS SurePost rates but do not, in fact, have SurePost enabled on your UPS account. (You would need to check this with your UPS rep to be sure.) If you don't have SurePost rates on your UPS account, do not check the checkbox for showing SurePost rates when you are authenticating Boxify at UPS.com, which will then allow this to work.
Another issue some users have run into is that the login credentials they are using to log in at UPS.com are for UPS CampusShip, which is a scheme UPS offers to large organizations allowing them to provide certain employees only limited privileges when logging into UPS.com. So those CampusShip login credentials may not allow you to authenticate third-party software. If you run into problems and see "CampusShip" at the top of the page when you log in at UPS.com, you'll need to find someone at your organization with master login credentials. Using those master login credentials to authenticate Boxify at UPS.com will then allow this to work.