unable to make IEEE bibliography work!

biblatex is rarely the right choice if you want to submit to a publisher. I recommend to assume that biblatex is not accepted by publishers unless they explicitly say otherwise.

Let's examine this conference's LaTeX template.

The Paper Submission Guidelines at https://panel.waset.org/conference/2021/05/paris/ICCAIT/guideline link to a LaTeX template at http://waset.org/downloads/latex.zip. That .zip file contains two files: The not very creatively named journal.cls and journal.tex. journal.cls is clearly the document class file and should probably not be modified or even read by authors, but journal.tex contains many comments. Given the state of the comments, it is however not at all clear to me how much of the comments are verbatim copy of the original template (clearly based on Michael Shell's IEEEtran class) and what is from the conference publishers.

Anyway, towards the end of journal.tex we find

% references section

% can use a bibliography generated by BibTeX as a .bbl file
% BibTeX documentation can be easily obtained at:
% http://www.ctan.org/tex-archive/biblio/bibtex/contrib/doc/
% The IEEEtran BibTeX style support page is at:
% http://www.michaelshell.org/tex/ieeetran/bibtex/
%bibliographystyle{IEEEtran}
% argument is your BibTeX string definitions and bibliography database(s)
%bibliography{IEEEabrv,../bib/paper}
%
% <OR> manually copy in the resultant .bbl file
% set second argument of begin to the number of references
% (used to reserve space for the reference number labels box)
begin{thebibliography}{1}

bibitem{IEEEhowto:kopka}
H.~Kopka and P.~W. Daly, emph{A Guide to LaTeX}, 3rd~ed.hskip 1em plus
  0.5em minus 0.4emrelax Harlow, England: Addison-Wesley, 1999.

end{thebibliography}

This suggests to me that the best course of action would be to use BibTeX and bibliographystyle{IEEEtran} and to copy the .bbl file into your paper before submission. There is no mention of biblatex and the recommended methods are completely incompatible with biblatex, so I recommend you do not use it.

Here's how things might look

documentclass[journal]{journal}

begin{document}
cite{sigfridsson}

bibliographystyle{IEEEtran}
bibliography{IEEEabrv,biblatex-examples}
end{document}

Compile this with LaTeX, BibTeX, LaTeX, LaTeX (use BibTeX and not Biber as you might do with biblatex). More background about BibTeX is at Question mark or bold citation key instead of citation number. When you finish your paper, take your .bbl file, which may look a bit like

% Generated by IEEEtran.bst, version: 1.14 (2015/08/26)
begin{thebibliography}{1}
providecommand{url}[1]{#1}
csname url@samestyleendcsname
providecommand{newblock}{relax}
providecommand{bibinfo}[2]{#2}
providecommand{BIBentrySTDinterwordspacing}{spaceskip=0ptrelax}
providecommand{BIBentryALTinterwordstretchfactor}{4}
providecommand{BIBentryALTinterwordspacing}{spaceskip=fontdimen2font plus
BIBentryALTinterwordstretchfactorfontdimen3font minus
  fontdimen4fontrelax}
providecommand{BIBforeignlanguage}[2]{{%
expandafterifxcsname l@#1endcsnamerelax
typeout{** WARNING: IEEEtran.bst: No hyphenation pattern has been}%
typeout{** loaded for the language `#1'. Using the pattern for}%
typeout{** the default language instead.}%
else
language=csname l@#1endcsname
fi
#2}}
providecommand{BIBdecl}{relax}
BIBdecl

bibitem{sigfridsson}
E.~Sigfridsson and U.~Ryde, ``Comparison of methods for deriving atomic charges
  from the electrostatic potential and moments,'' emph{Journal of
  Computational Chemistry}, vol.~19, no.~4, pp. 377--395, 1998.

end{thebibliography}

and copy it into your .tex file replacing the two lines

bibliographystyle{IEEEtran}
bibliography{IEEEabrv,biblatex-examples}

resulting in

documentclass[journal]{journal}

begin{document}
cite{sigfridsson}

% Generated by IEEEtran.bst, version: 1.14 (2015/08/26)
begin{thebibliography}{1}
providecommand{url}[1]{#1}
csname url@samestyleendcsname
providecommand{newblock}{relax}
providecommand{bibinfo}[2]{#2}
providecommand{BIBentrySTDinterwordspacing}{spaceskip=0ptrelax}
providecommand{BIBentryALTinterwordstretchfactor}{4}
providecommand{BIBentryALTinterwordspacing}{spaceskip=fontdimen2font plus
BIBentryALTinterwordstretchfactorfontdimen3font minus
  fontdimen4fontrelax}
providecommand{BIBforeignlanguage}[2]{{%
expandafterifxcsname l@#1endcsnamerelax
typeout{** WARNING: IEEEtran.bst: No hyphenation pattern has been}%
typeout{** loaded for the language `#1'. Using the pattern for}%
typeout{** the default language instead.}%
else
language=csname l@#1endcsname
fi
#2}}
providecommand{BIBdecl}{relax}
BIBdecl

bibitem{sigfridsson}
E.~Sigfridsson and U.~Ryde, ``Comparison of methods for deriving atomic charges
  from the electrostatic potential and moments,'' emph{Journal of
  Computational Chemistry}, vol.~19, no.~4, pp. 377--395, 1998.

end{thebibliography}
end{document}