Unable to set up UPS Integration

I am trying to set up UPS integration in a full NetSuite account without success.  I enter all the required fields, including the UPS account number, and then click Submit.  Nothing happens.

I have successfully set up UPS integration in other NetSuite accounts.  I also tried this particular UPS account number in another NetSuite account, and it worked.  I subsequently deleted it to ensure there was not an account conflict.

I suspect there may be an issue relating to the location field.  It is not showing as mandatory, and there is nothing in the drop down box.  We had set up two locations a couple of years ago, but have since made the second location inactive.  This may have resulted in a database conflict with UPS integration as NetSuite still has a record indicating more than one location, but the UPS form does not.