The phrase "challenge emerges when" is correct and usable in written English.
You can use it to introduce a situation or condition that leads to a challenge or difficulty.
Example: "A challenge emerges when team members fail to communicate effectively."
Alternatives: "a challenge arises when" or "a challenge occurs when".
Unique challenges emerge when sharing pediatric or pregnancy-related data.
Even more challenges emerge when facing automatic service composition in markets of composed services for end users.
Also, new challenges emerge when attempting to attack problems whose solution by means of simulation-based optimization was not even possible in the past.
Often, challenges emerge when the proliferation of data morphs into "Big Data"—a term lacking any precise definition, but used with abandon nonetheless.
Looking at the U.S. for example, certain challenges emerge when gauging city-level resilience and, therefore, national readiness in the face of critical risks.
"Vocational training is offered to adolescents in the district but new challenges emerge when they try market their products.
That too can be very difficult, I think, and I don't know how to handle it when you have all these people and changes nearly every day.' Ethical challenges emerged when health care professionals did not agree due to different viewpoints.
The challenge of increasing returns emerges when individuals initially invest an excessive amount of financial and technical resources into an institution, ultimately making it too costly to switch to another more efficient institution notwithstanding the known inefficiencies associated with the existing institution (ibid).
One of the most difficult challenges for public health ethics emerges when this important moral function conflicts with the injunction to improve, if not maximize, aggregate or collective health outcomes.
There is also a caustic side of his personality that emerges when he is challenged.
