https://lichess.org/sqhT89au/black#131

Two knights cannot deliver a mate. Therefore, I wonder why this game was not decided as draw due to insufficient mating material? lichess.org/sqhT89au/black#131

Well yes technically two knights can deliver mate. But only if you help the knights.

Two knights can deliver a mate if black plays poorly. Example:

Ok, thanks.

A mate is possible but you cannot force it.

A mate is possible but you cannot force it.
<iframe width=600 height=371 src="lichess.org/study/embed/DV18bwAI/dkW2stun#0" frameborder=0></iframe>

#6 @GandalfKOTH …Kxa5 is not forced. You can take the knight on c7. Sure, it's still winning for white but not with two knights, unless you promote your pawn to a knight and black helps you mate with those remaining knights, but in that case it won't be "forced".