This was contained in a statement by Femi Adesina, presidential spokesman.
The minister felt that her position is becoming untenable and is hurting the President in the run up to the 2019 election.
The confusion over her alleged resignation was heightened by her absence at the Meeting of the Convergence Council of Ministers and Governors of Central Bank of West African Monetary Zone where she was represented by the Permanent Secretary Dr. Mahmood Isa Dutse.
Nigeria opposition party, the People's Democratic Party (PDP), has called for the immediate arrest and prosecution of the former minister of finance, Kemi Adeosun.
Strawberry sabotage: WA not affected by needle contamination
Berry Obsession, Berry Licious, Love Berry, Donnybrook Berries, Delightful Strawberries, and Oasis are the brands affected. Sunshine Coast grower Adrian Schultz said the contamination scare was the last thing the industry needed.
The opposition party also stated that Buhari must be held responsible for all infractions in the finance ministry under Adeosun, as he appointed and retained her despite having information on the certificate forgery.
"I have, today, become privy to the findings of the investigation into the allegation made in an online medium that the Certificate of Exemption from National Youth Service Corp (NYSC) that I had presented was not genuine", the embattled minister said in her letter.
PDP further calls on worldwide community to stop an alleged plot by the ruling party All Progressives Congress and the Federal Government have plans to "secretly" move the minister out of the country.
A source told newsmen in August that President Buhari may "pardon" the minister as a reward for "the great works she has done for government - bailing out the country from recession and stabilizing the economy".