Foreign Minister Maria Fernanda Espinosa said officials accepted Assange's request for naturalization in December, and they continue to look for a long-term resolution to a situation that has vexed officials since 2012.
Swedish prosecutors in May dropped their investigation into the rape allegations, but British police have said Assange would still be arrested if he left the embassy.
In London, media reports said the British government has also refused to guarantee that Assange will not be extradited to the United States where he could face charges for his role in releasing classified documents.
The rape allegations case remains open and active. The following year, Ecuador demands that Britain allows Assange to fly to Quito.
His stay in the Ecuador embassy has been reported to have cost the Metropolitan Police in London several million us dollars in police presence outside the embassy.
Ecuador's Foreign Ministry in a statement said it was seeking to resolve Assange's situation, without making reference to the citizenship issue.
A Foreign Office spokesman said: "The government of Ecuador recently requested diplomatic status for Assange here in the UK".
News of the Ecuadoran move to grant Assange citizenship emerged Wednesday when the Ecuadoran newspaper El Universo reported that, according to the country's civil register, he had been assigned an identity number. You also can't blame the man for trying to get out in a way that would make it harder for him to be extradited to the United States of America, particularly after US Attorney General Jeff Sessions said his arrest was "a priority" last April. The Ecuadorian government has granted him political asylum.
Assange has been living in a small office at the country's London Embassy, which gave him asylum in August 2012.
A United Nations panel concluded in 2016 that Mr Assange was under arbitrary detention.
WikiLeaks co-founder Julian Assange has cryptically uploaded a picture of himself dressed in the national colors of Ecuador.