Why \cref or \lccref does not work for assumption?

Question

I am using latex with rmarkdown package. The following is the YAML heading in which the packages are located and the written text.

- \usepackage{amsmath}
- \usepackage{amsthm}
- \usepackage{bbm}
- \numberwithin{equation}{section}
- \usepackage{makecell}
- \usepackage{indentfirst}
- \usepackage{geometry}
- \usepackage{graphicx}
- \usepackage{tikz}
- \usepackage{verbatim}
- \usepackage{chronosys}
- \usepackage{stackengine}
- \usepackage{booktabs, colortbl, xcolor}
- \usepackage{babel}
- \usetikzlibrary{arrows.meta,calc}
- \usepackage[font=small]{caption}
- \usepackage{adjustbox}
- \usepackage{tabularx}
- \usepackage{pgfplots}
- \pgfplotsset{compat=1.7}
- \usepackage[makeroom]{cancel}
- \usetikzlibrary{arrows,decorations.markings}
- \usetikzlibrary{intersections}
- \usepackage[nottoc]{tocbibind}
- \newtheorem{prop}{Proposition}
- \theoremstyle{definition} 
- \newtheorem{assumption}{Assumption}
- \newtheorem{definition}{Definition}
- \newtheorem{algorithm}{Algorithm}
- \usepackage[T1]{fontenc}
- \usepackage{tabularx,ragged2e,booktabs,caption}
- \newenvironment{rcases}
  {\left.\begin{aligned}}
  {\end{aligned}\right\rbrace}
- \renewcommand{\refname}{References}
- \UseRawInputEncoding
- \usepackage[utf8]{inputenc}
- \usepackage{hyperref}
- \hypersetup{
     colorlinks=true,
     linkcolor=black,
     filecolor=blue,
     citecolor = blue,      
     urlcolor=blue,
     }
- \usepackage{subcaption}
- \usepackage[font=small,labelfont=bf]{caption}
- \usepackage{float}
- \usepackage{flafter}
- \floatstyle{plaintop}
- \restylefloat{table}
- \setlength{\parindent}{2.5em}
- \setlength{\parskip}{0em}
- \usepackage{adjustbox}
- \usepackage[style=english]{csquotes} 
- \usepackage[colorlinks,allcolors=red]{hyperref}
- \usepackage[nameinlink,noabbrev]{cleveref}
- \creflabelformat{equation}{#2\textup{(\textcolor{red}{#1})}#3}
- \creflabelformat{assumption}{#2\textup{(\textcolor{red}{#1})}#3}
- \creflabelformat{proposition}{#2\textup{(\textcolor{red}{#1})}#3}
- \creflabelformat{figure}{#2\textcolor{red}{#1}#3}
- \creflabelformat{table}{#2\textcolor{red}{#1}#3}
- \creflabelformat{section}{#2\textcolor{red}{#1}#3}
...

\medskip
 \makeatletter
 \renewcommand\@makefnmark{\hbox{\@textsuperscript{\normalfont\color{red}\@thefnmark}}}
 \newcommand{\lccref}[1]{\lcnamecref{#1}~\labelcref{#1}}
 \makeatother 
\pagebreak
  \tableofcontents
 
\pagebreak
\section{Introduction}


\begin{assumption}\label{assump1}
    \normalfont The production is assumed to adopt a single technology.
    \end{assumption}

    \cref{assump1} suggests something.

But it prints ?? suggests something..

Answer 1

If you load amsthm before hyperref and cleveref, you do not need to execute any of the \creflabelformat directives (as they're essentially replicating the respective defaults), and you don't need to run \crefname{assumption}{assumption}{assumptions} either.

\documentclass{article} % or some other suitable document class

\usepackage{amsthm} % for \theoremstyle and \newtheoerem macros
\usepackage[colorlinks,allcolors=red]{hyperref}
\usepackage[nameinlink,capitalize,noabbrev]{cleveref}

\newtheorem{prop}{Proposition}
\newtheorem{algorithm}{Algorithm}
\theoremstyle{definition} % <-- new (to use upright font shape for theorem body)
\newtheorem{assumption}{Assumption}
\newtheorem{definition}{Definition}


\begin{document}
\begin{assumption}\label{assump1}
Production is assumed to adopt a single technology.
\end{assumption}

\noindent
According to \cref{assump1}, \dots
\end{document}