Font for U+A734, U+A735?

Do not use either inputenc or fontenc with xetex or luatex so start by removing them, then use fontspec and specify any font that has these characters (eg you could use whichever font your browser picks to display the character).

I used the Windows Arial font here, as that has quite wide coverage.

documentclass{article}

usepackage{fontspec}
setmainfont{Arial}

begin{document}


testꜵ


end{document}