In the MWE below, you will see that \cref is not working with hyperref. Also, even with the conventional \ref command, hyperref leads to the wrong equation
This is the output
This is where \ref takes us (right under Equation 1, instead of Equation 1 itself)
One solution is mentioned in cleveref hyperlink not working in beamer redefines \cref as follows
\let\chyperref\cref % Save the orginal command under a new name
\renewcommand{\cref}[1]{{\hyperlink{#1}{\chyperref{#1}}}} % Redefine the \cref command and explictely add the hyperlink.
The solution above works only to reference only one equation. If multiple equations are referenced, hyperlink will always take us to the beginning of the document. This means that \cref with this solution is pretty much the same as \ref
\documentclass[aspectratio=169, xcolor={x11names}]{beamer}
\usecolortheme{seahorse}
\useoutertheme[]{miniframes}
\useinnertheme{inmargin}
\setbeamersize{sidebar width left=1cm, sidebar width right=1cm}
\setbeamersize{text margin left=0.5mm, text margin right=0.5mm}
\usepackage{hyperref}
\hypersetup{citecolor=SlateBlue2, citebordercolor=SlateBlue2,
linkbordercolor=DodgerBlue3, linkcolor=DodgerBlue3, urlcolor=Blue1, colorlinks=true}
\usepackage{cleveref}
% Single equations (non-breakable)
\crefformat{equation}{\mbox{Eq. #2(#1)#3}}
\crefrangeformat{equation}{\mbox{Eqs. #3(#1)#4 to #5(#2)#6}}
\crefmultiformat{equation}{\mbox{Eqs. #2(#1)#3}}{ and #2(#1)#3}{, #2(#1)#3}{ and #2(#1)#3}
\crefrangemultiformat{equation}{\mbox{Eqs. #3(#1)#4 to #5(#2)#6}}{ and #3(#1)#4 to #5(#2)#6}{, #3(#1)#4 to #5(#2)#6}{ and #3(#1)#4 to #5(#2)#6}
\let\chyperref\cref % Save the orginal command under a new name
\renewcommand{\cref}[1]{{\color{blue}\hyperlink{#1}{\chyperref{#1}}}} % Redefine the \cref command and explictely add the hyperlink.
\begin{document}
\begin{frame}{Title Here}
\begin{block}
\begin{align}
A &= B
\label{eq1}
\\
&= C
\label{eq2}
\\
&= D
\label{eq3}
\end{align}
\end{block}
\end{frame}
\begin{frame}{Title Here}
\begin{block}
\begin{align}
A &= B
\label{eq4}
\\
&= C
\label{eq5}
\\
&= D
\label{eq6}
\end{align}
\end{block}
\end{frame}
\begin{frame}{Title Here}
\begin{block}
\begin{align}
A &= B
\label{eq7}
\\
&= C
\label{eq8}
\\
&= D
\label{eq9}
\end{align}
\end{block}
\end{frame}
\begin{frame}
contents in between
\end{frame}
\begin{frame}
\cref{eq1}
\cref{eq1,,eq2}
\cref{eq1,eq2,eq3}
\cref{eq1,eq2,eq3,eq7,eq8,eq9}
\cref{eq1,,eq2,,eq3,eq7,eq8,eq9}
\cref{eq6,eq7,eq9}
Eq. \ref{eq1}
\end{frame}
\end{document}
