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Because you can see the same comment from many different Lemmy websites, there are many different links that point to the same comment. The website only accepts links from the same instance as the comment author.

On desktop, you can get this link by clicking this button:

Bu default, links copied within Mlem will be from your instance, not the author’s instance. You can customize this behavior by going to the Settings tab -> Media & Links -> Share Links.

Selecting “original instance” will cause all links you copy to be the ones that Lemvotes requires.

There’s a button for it in the toolbar above the keyboard. You need to scroll horizontally on the toolbar to see the button.