"Myanmar should act in accordance with the agreement they have signed with Bangladesh (regarding the repatriation of the Rohingyas)", she said.
The team members will conclude their three-day visit to Bangladesh on Monday, when they leave for Myanmar.
Myanmar's allies Russian Federation and China - both permanent members with the veto power in the Security Council - have shown resistance to the involvement of the world body in the refugee crisis.
Rohingya insurgent attacks on security posts in Rakhine on 25 August sparked the military operation that has sent almost 700,000 Rohingya fleeing to camps in Cox's Bazar in Bangladesh. Both U.N. officials on the ground and council members in NY vacillated over how to respond to the ethnic cleansing campaign of Myanmar's military against the Rohingya Muslim minorities in mid-2017. Thousands are believed to have been killed.
Bangladesh and Myanmar agreed in December to begin repatriating the refugees in January, but there were concerns among aid workers and Rohingya that they would be forced to return and face unsafe conditions in Myanmar.
The visiting United Nations officials are: Claudia Angela Banz of Switzerland, Nesrin Said Amin Hannoun of Jordan, Ahmed Mohamed Abdel Wahab RHB Feshawl of Egypt, Nabi ShafikAwad of the USA, Miranda Camillelucy Moses of Trinidad and Tobago, Igro Anson Gill of Barbados, Jung Hawan Lee of the USA, David Michael Kinna of the UK, Luis Amadeo Solari Antonia of Peru, and Kuwait counsellor S SS Alfassam Talal.
The UN refugee agency and Bangladesh recently finalized a memorandum of understanding that said the repatriation process must be "safe, voluntary and dignified.in line with worldwide standards".
"The problem there lies in their expulsion, treatment and the fact that they had to flee to Bangladesh", she said.
Myanmar has faced intense global pressure over its clampdown on the Rohingya.
The Security Council delegates met Myanmar's civilian leader Aung San Suu Kyi and the military commander-in-chief Sr.
The Tatmadaw - another name for Burma's military - has denied accusations of genocide and ethnic cleansing, maintaining it is carrying out legitimate response to attacks by "terrorist" Rohingya rebel groups.
The Rohingya had lived in Myanmar for generations but were denied citizenship and branded illegal immigrants from Bangladesh, which likewise denies them citizenship.
Some of the Rohingyas are seen displaying placards that read: "We want justice", "Welcome to UNSC delegation" and "Not Bangali, Yes Rohingyas".
They also said the global community is standing beside Bangladesh over the Rohingya issue.
Tayab, who was using crutches, said he was shot by Myanmar troops in his right leg. He claimed Myanmar soldiers shot dead his brother, uncle and a nephew.
"We told them that we're staying here to save our lives. They should listen to us".