The phrase "a failure to emphasize" is correct and usable in written English.
It can be used when discussing the lack of focus or importance given to a particular point or issue.
Example: "The report highlighted a failure to emphasize the significance of early intervention in educational settings."
Alternatives: "a neglect to highlight" or "an oversight in stressing".
They talked about the biggest mistakes -- from her vote to authorize the Iraq War, to her refusal to use a State Department email address, to the failure to emphasize her gender in the 2008 campaign.
This approach avoids a focus on individual responsibility alone, which may lead to victim blaming and failure to emphasize policies and institutional factors that affect large populations and systematically create and maintain racial, gender, and socioeconomic disparities in health.
She has made clear repeatedly that she believes strongly in diplomacy and that the Bush administration's failure to emphasize it has been terrible for our nation.
DSM-IV emphasizes a failure to initiate or respond to social interactions across a range of relationships and ICD-10 similarly focuses on contradictory or ambivalent social responses that extend across social situations.
Again, we clarified the manuscript to emphasize that the failure of 3-IB-PP1 to initiate Erk/Akt signaling is not simply a failure to pass some threshold strength of membrane-proximal signaling.
Sidney Webb, nevertheless, came to accept that the failure to sufficiently emphasize equality was a weakness.
The failure of top management to emphasize new technologies was the number one problem cited in the survey.
Kelly's book does not really tell this sad tale in a linear fashion, but throughout he tries to emphasize the failures of British policy makers and the lack of attention given to the crisis in England.
More surprising is the failure of "The Ellis Island Experience" to emphasize the changing dynamic of immigration.
It instructed diplomats to "emphasize that failure to halt the flow" of chemicals and equipment into Syria, Iran and North Korea could render irrelevant a group of antiproliferation countries that organized to stop that flow.
