cite webpage with custom .bst file

I am supposed to use mdpi style for my paper. In overleaf, they have a template where there is mdpi.bst style file. It has the following webpage citation function:

 FUNCTION {www}
{ output.bibitem
  format.authors "author" output.checkwoa
  new.block
  format.title "title" output.check
  new.block
  format.website "url" output.check
  format.eprint output
  new.block
  note output
  formatfull.doi output
  fin.entry
}

in my .bib file I put a webpage citation like this:

@www{biorender2020mdpi,
    author = {BioRender.com}, 
    title = {Pro- and Anti-Tumor Immune Cells in the Tumor Microenvironment},
    url = {https://app.biorender.com/biorender-templates}
}

in my .tex file I have the following lines (all supporting files are in the Definitions folder while my tex file is outside of that folder, that’s why I put a path here):

bibliographystyle{Definitions/mdpi}
bibliography{Definitions/bibliography.bib}

When I try to cite the webpage

cite{bio...}

it doesn’t show me my biorender2020mdpi object and there is a question mark in my pdf afterwords.

How to solve it?