How can I tell if I'm on a custom post type archive page?

I have set up a custom post type and a custom taxonomy for it. I’m using the latest version of WordPress. I believe I should be using the is_post_type_archive function, but this seems to be is returning false no matter what.

The post type I’ve set up is called articles and the taxonomy is called editions

I’m trying to access /editions/september and the archive page is showing, but the page title is showing as the first post’s title. I can fix this if I can figure out how to write a conditional if statement to let me know I am in a custom post type custom taxonomy page. How can I achieve that?

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