Sometimes online open access journals use article numbers instead of page numbers.
If you are referencing an online article which has an article number instead of a page range, include the word 'Article' and use the article number instead of the page range.
See also the guidance on the APA's Style website at:
(Neville et al., 2020)
Neville et al. (2020)
Neville, F. G., Drury, J., Reicher, S. D., Choudhury, S., Stott., C., Ball, R., & Richardson, D. (2020). Self-categorization as basis
of behavioural mimicry: Experiments in The Hive. PLoS ONE, 15(10), Article e0241227.