In September last year, a Yangon district court sentenced Wa Lone and Kyaw Soe Oo to seven years in prison for illegal possession of official documents, sparking an global outcry from activists and diplomats in a case seen by many as a test of Myanmar's fledgeling democracy.
"Today's ruling is yet another injustice among many inflicted upon Wa Lone and Kyaw Soe Oo", Reuters Editor-In-Chief Stephen J. Adler said in a statement Friday.
This morning, however, a judge ruled that it was a "reasonable decision" that was "not wrong according to the law" as he dismissed the appeal. The officer, Capt. Moe Yan Naing was dropped from the force after his testimony and jailed for a year for breaking police regulations.
Lawyers for Wa Lone, 32, and Kyaw Soe Oo, 28, had filed the appeal in November against their conviction, citing evidence of a police set-up and lack of proof of a crime.
Outside the country, the two men have been hailed as heroes and jointly named Time Magazine's Person of the Year 2018, alongside other persecuted and slain journalists.
The trial of the pair was widely criticised, with human rights groups and worldwide governments accusing the Myanmar regime of using the courts to target the two reporters for their reporting on the military-led massacre of Rohingya muslims in the village of Inn Din in Rahkine.
"It casts serious doubts on the independence of the judiciary of Myanmar and for people's right to information and learning the truth", he said.
Jeremy Hunt, the British foreign secretary, who made earlier pledges to champion the journalists' cause, on Friday called on Ms Suu Kyi to take a "personal interest" in the case.
Kyaw Soe Oo's wife, Chit Su, said the ruling came as a surprise. He said they meant to harm national security and the national interest. "We were expecting to welcome them in front of Insein Prison".
The reporters' legal team can lodge an appeal with Burma's supreme court, but a presidential pardon would be an alternative option to securing their release.
"(The decision) shows her contempt and the contempt in the country for worldwide opinion", Zawacki said.
The reporters' work and stand for freedom of the press have earned them awards and plaudits.
They had been collecting evidence about the murders of 10 Rohingya men by the army in the village of Inn Din in northern Rakhine in September 2017.