This website has a tutorial for five ways of attaching sequins to fabric.
Of course if you try this on needlepoint canvas, use a sharp needle (crewel needle, beading needle, etc.) so that you can pierce the underlying canvas threads. What really matters is the size of the sequin. You'll have to fiddle with them to figure out the right size.
I do have the sequin sizer I made up to help you figure out the right size but nothing is better than doing an audition on your canvas.
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