Mr Jammeh initially conceded defeat to Adama Barrow before changing his mind.
A visit by the leaders of Nigeria, Ghana, Liberia and Sierra Leone on Tuesday failed to convince jammeh.
Tuesday also saw Mr Jammeh's party challenge the election in the country's supreme court.
But Mr Ibn Chambas, who visited The Gambia on Tuesday, said the legal process was separate from Mr Jammeh's mandate as president and he had to step down when it ends on 19 January.
"For Mr Jammeh, the end is here and under no circumstances can he continue to be president," he said
Even if the court does consider the case, it is unclear whether it will reach a decision before the end of Mr Jammeh's term in office, a spokesman for The Gambia Bar Association has said.
The head of the Gambian electoral commission, Alieu Momar Njai, has said corrected election results do not change the overall outcome and Mr Barrow was still the winner.
The UN and US interventions follow Tuesday's visit by the four West African leaders,
Liberia's President Ellen Johnson-Sirleaf said a deal was not something that could happen in a day and said a report of their discussions would be made on Saturday to a meeting of the West African grouping Ecowas.
However Mr Ibn Chambas said he did not think military intervention to force Mr Jammeh from power would be necessary, after a senior Ecowas official said that a military option would be "conceivable" if diplomacy failed.
"It may not be necessary. Let's cross that bridge when we get there," he said.
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