# Difficulty accessing OpenType ligatures with LuaLaTex and fontspec

I’ve been trying to use Greek ligatures with the font Alfios in the version available here. In particular, I’m trying to get the o-u ligature as can be seen in the image — that I get from MS Word.

However, when I put in the code below, I get the following image as output.

Why does this not work? Any ideas?

\documentclass[]{article}

\usepackage{fontspec}
\newfontfamily{\sobergreek}{Alfios}

\begin{document}

\noindent
Οὔ σε φιλῶ, Σαβίδι’, οὐχ οἷός τ’ ὤν τοῦ χάριν εἰπεῖν.\\
Οὐδὲ λέγειν δύναμαι πλείονά γ’· οὔ σε φιλῶ

\end{document}


The solution in Historic font and missing ligatures appears related, but that’s a hack where you redefine the ligatures. I’m just trying to use the relevant font feature.

You should activate the greek script:

\documentclass[]{article}

\usepackage{fontspec}
\newfontfamily{\sobergreek}{Alfios}

\begin{document}