Stuck in a loop when trying to delete custom fields

I have a custom field I want to delete. When I try to do that, it tells me it can’t deleted because it is used in a template. I don’t know what template that is (and I would like it removed from the template regardless). It also says it is used in 5 portfolios - these are old and have been deleted, so not sure what I can do about that? Any help would be appreciated. I am totally stuck.

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