The phrase "acknowledged instances" is correct and usable in written English.
It can be used when referring to specific occurrences or examples that have been recognized or accepted in a particular context.
Example: "The report highlighted several acknowledged instances of misconduct within the organization."
Alternatives: "recognized cases" or "accepted examples".
While Ms. Pearce acknowledged instances of tension, she said the relationship ultimately broke down over who called the shots.
But he acknowledged "instances when — despite the extraordinary precautions we take — civilians have been accidentally injured, or worse, killed in these strikes.
Brennan defended the missile strikes by unmanned Predator or Reaper drones as a more humane form of war, but he acknowledged "instances when, regrettably and despite our best efforts, civilians have been killed".
Cathy Paykin, transplant programs director at the National Kidney Foundation, said the first publicly acknowledged instance of donor altruism occurred in 1999, when a nurse allowed doctors at Johns Hopkins University to remove a kidney using the then new method of laproscopy.
It is about speaking out and acknowledging instances of misogyny.
They must acknowledge instances of discrimination and mistreatment and support medical trainees' decisions on how to move forward with care.
Investigators acknowledged "isolated instances where slot machine use has had a negative impact on specific individuals," but said military personnel stationed at overseas bases that offer slot machines actually experience fewer instances of financial problems than do those stationed in the United States.
Mr. Gamal has acknowledged, for instance, that he has not raised much of the $100 million needed to build the center.
Senior executives have acknowledged, for instance, that they erred in statements describing Mr Kelly as an "intelligence source"; in fact, he was not a member of the intelligence services.
Mr. Sheekey acknowledged, for instance, that in 2005, the mayor paid $1 million to the Republican Party for services very similar to those promised by Mr. Haggerty in 2009.
It is rarely acknowledged, for instance, that if a Lib-Lab coalition had been formed in May 2010 (a very big if) it would not have had a majority of seats in England.
