The International Tennis Federation said today that it "regrets and respectfully disagrees" with Hong Kong's decision to pull out of the Zone Group matches.
The Davis Cup committee had ruled that the Pakistan Sports Complex in the capital could host the April 7-9 second-round encounter. Pakistan hosted matches against Iran in February.
Now Pakistan will face Philippines or Thailand in the third round.
The ITF said that Hong Kong's default will now be considered by the Internal Adjudication Panel "to determine whether a breach has been committed."