I created a layout containing an archive cell. I then assigned this layout to a taxonomy archive page. When I browse to that page in frontend, I can only see a notification saying "Archive Page: There is no Layout assigned". Which is wrong.
The taxonomy is a 3rd party plugin (https://wordpress.org/plugins/the-events-calendar/) taxonomy which I can't see in Types>custom taxonomies.
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I assume we are talking about the archive page of "Event Categories", which is created withplugin " the-events-calendar", I can duplicate same problem in my localhost with the-events-calendar + Layouts + Toolset starter theme, and put it into our to-do list, escalated this thread to our 2nd Tier supporters. hope there is a workaround for your case.
I’m Adriano, Toolset support lead and I have been escalated to this thread. I’ll give my best to help you to achieve your needs through Toolset components.
The problem seems to be related with the way that Events Calendar rewrites the slug of the taxonomy. I've forwarded that problem to our development team and they will check that soon. Thank you for reporting.