An IQ score from a test administered by a psychologists (e.g. during a neuropsychological exam) comprises multiple indices. For example, the Wechsler Adult Intelligence Scale (WAIS) looks at four components of intelligence:

Verbal Comprehension Index (VCI)
Perceptual Reasoning Index (PRI)
Working Memory Index (WMI)
Processing Speed Index (PSI)

Suppose we forget about the limitations of IQ tests in predicting social and career achievements. Even then, it is possible to have a high overall IQ but a sufficiently low IQ one/more index that it significantly reduces one's quality of life. The discrepancy might be enough to constitute a disability.

E.g. my cousin's VCI is in the 99th percentile (WAIS, neuropsychological evaluation). Very high IQ overall. However, his PRI is so low that he was diagnosed with a non-verbal learning disability and other neurological conditions.

Things he finds very challenging: coordination (walking, tying shoelaces, folding clothes), socializing (he has trouble interpreting social cues and maintaining eye contact), topics that require non-verbal learning and spatial coordination. These challenges also impact overall motivation and happiness.

TLDR; IQ is just a number.