The 22-year-old, who won gold at the World Championships in Doha last year, was charged and provisionally suspended by the Athletics Integrity Unit (AIU) in June.
According to World Athletics Anti-Doping Rules, any combination of three whereabouts failures -- filing failures or missed tests -- within a 12-month period by an athlete constitutes an anti-doping violation.
Athletes guilty of whereabouts failures could face two-year bans or a minimum of one year depending on the degree of fault.
In Naser's case, the disciplinary tribunal upheld three of the four AIU charges against her -- a filing failure effective Jan. 1, 2019 and two missed tests, on March 12 last year and Jan. 24 this year.
However, the tribunal found in Naser's favour with regard to a third alleged missed test on April 12, 2019, which resulted in the charges being dismissed because her three whereabouts failures did not occur within a 12-month rolling period.
"This was a case very much on the borderline and we hope the athlete will learn from the experience and heed the AIU's warnings," the tribunal said in a statement https://www.athleticsintegrity.org/downloads/pdfs/disciplinary-process/en/201014-World-Athletics-v-Salwa-Eid-Naser-Final-Decision.pdf. (Reporting by Simon Jennings in Bengaluru, editing by Pritha Sarkar)