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uc_usps.countries.inc has two values for country ID 688:
688 => 'Serbia, Republic of',
688 => 'Serbia-Montenegro',
The second value is not correct and prevents a shipping quote from being returned for Serbia.
This is documented at http://pe.usps.gov/text/imm/immctry.htm
Comments
Comment #1
TR CreditAttribution: TR commentedThanks for finding that problem. The fix has been committed.
Comment #2
longwaveThis seems to need cherry picking into the D8 branch as well.
Comment #3
longwaveThe same fix has been committed to the 8.x and 6.x branches.