Does a brand owner that doesn’t sell on Amazon need an Amazon seller account?

This is my first time posting in this community. Hopefully, this is an appropriate place to post this question:

As a brand owner (with a claimed brand registry), do I also need an Amazon Seller Account to fix existing listings of my products and to add better photos? We don’t sell anything on Amazon, ourselves, but we have a number of customers that are third-party sellers on Amazon. Unfortunately, some of the listings are a bit of a mess with some outdated information.

I would like to continue allowing these resellers to sell our products, but I want to improve the listings.

Thanks in advance!

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EDIT: My follow up question would be: Will editing / improving the listings mess anything up for our third-party sellers? Could it prevent them from selling or cause them any unintended aggravation?