The phrase "acknowledged frustration" is correct and usable in written English.
It can be used when referring to a recognized or accepted feeling of annoyance or dissatisfaction in a particular situation.
Example: "In the meeting, she expressed her acknowledged frustration with the delays in the project timeline."
Alternatives: "recognized frustration" or "accepted frustration".
In private briefings and in public testimony to Congress, a long line of senior American officers have acknowledged frustration with the battle against Islamic State.
They greeted the announcement, even though they privately acknowledged frustration about politicians standing on 'principles' when issues applied to other families, and change them when it becomes personal.
Yankees Manager Joe Torre acknowledged frustration is inevitable at times like this, and reiterated that the team must keep grinding away.
A year after Mr. Obama took office, Mr. Sorensen acknowledged frustration with his presidency, particularly the decision to send more troops to Afghanistan, a conflict that he called "Obama's Vietnam".
Mr Romney kept up his attack on Mr Obama's economic record, telling supporters in Virginia that "if you believe America should be on a better course, if you're tired of being tired... then I ask you to vote for real change". At a rally in Ohio, the president acknowledged frustration with the still-lagging economy but told voters "our work is not done yet".
Center Chris Kaman, also an impending free agent, acknowledged frustration with D'Antoni.
Manning also acknowledged frustrations in the Slabinski case.
The president declared that law would be enforced "firmly" but also acknowledged frustrations in immigrant neighborhoods and urged dialogue.
Privately, U.S. officials acknowledge frustration at the slow pace of the push to remove Maduro and win new recruits to the coalition against him.
While acknowledging frustration with endemic corruption in Brazil, they argued that the protesters' nonspecific goals and destruction of property eliminated any chance that the movement would lead to social change.
Now, from her exile, she acknowledges frustration in trying to keep the cause alive.
