mismatch
n. countablen. a situation where two things do not fit together or do not match each other. You use this when there is a difference between what you have and what you need.
n. a failure to correspond or match; a discrepancy between two or more elements. Often describes a lack of alignment between skills and requirements or supply and demand.
There is a mismatch between his skills and the job.
The project failed because of a clear mismatch between the ambitious goals and the limited budget available.
Economists often point to a structural mismatch in the labor market, where the qualifications of the unemployed do not align with the technical requirements of vacant positions.
From mis- + match (verb sense).
From mis- + match (noun sense).
Commonly paired with the preposition 'between' to identify the two conflicting elements.