API: filter entries by taxonomy not working

Hi, I'm trying to filter entries based on taxonomy. Like this:

/api/collections/articles/entries?filter[taxonomy:categories]=category-slug

And like this..

/api/collections/articles/entries?filter[taxonomy:categories]=categories::category-slug

But it's not working. Am I doing it wrong?

Answered by Erin Dalzell!
>>>>>>> Answered <<<<<<<
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