Citation problem with natbib

I have some problems with citations with natbib. Here’s my code:

documentclass[a4paper,11pt]{article}
pdfoutput=1 % if your are submitting a pdflatex (i.e. if you have
             % images in pdf, png or jpg format)

usepackage{jcappub} % for details on the use of the package, please
                     % see the JCAP-author-manual

usepackage[T1]{fontenc} % if needed

usepackage{amsmath}
usepackage{amssymb}
usepackage{caption}  

bibliographystyle{achemso}
usepackage[authoryear]{natbib}

bibliography{mybib.bib}
usepackage{tikz}
begin{document}
section{Introduction}
citep{Mondal2020}
end{document}

And here’s my .bib file:

@ARTICLE{Mondal2020,
       author = {{Mondal}, Sushovan and {Ali}, Saif and {S}, Shanima and {Banerjee}, Narayan and {Mortuza Hossain}, Golam},
        title = "{Propagation of gravitational waves in various cosmological backgrounds}",
      journal = {arXiv e-prints},
     keywords = {General Relativity and Quantum Cosmology},
         year = 2020,
        month = apr,
          eid = {arXiv:2004.13554},
        pages = {arXiv:2004.13554},
archivePrefix = {arXiv},
       eprint = {2004.13554},
 primaryClass = {gr-qc},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2020arXiv200413554M},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

Why when I’m trying to create pdf, I’m instead of citation receiving [?]? Any help will be appreciated. Thanks.

documentclass[a4paper,11pt,authoryear]{article}
begin{filecontents}[overwrite]{mybib.bib}
@misc{Mondal2020,
      title={Propagation of gravitational waves in various cosmological backgrounds}, 
      author={Sushovan Mondal and Saif Ali and Shanima S and Narayan Banerjee 
              and Golam Mortuza Hossain},
      year={2020},
      eprint={2004.13554},
      archivePrefix={arXiv},
      url={https://arxiv.org/abs/2004.13554},
      primaryClass={gr-qc}
}
end{filecontents}

usepackage[T1]{fontenc}
usepackage{xurl}
usepackage{jcappub} % this package loads 'natbib' automatically
bibliographystyle{achemso}

begin{document}
section{Introduction}
citep{Mondal2020}
bibliography{mybib}
end{document}