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Data entity EcoResProductConfigurationEntity (Configurations) doesn't enabled as public entity. So it's not possible to have access to the Configurations through Excel add-on and OData Web API calls.

Other similar entities, like Sizes, Colors, Styles are already public.
STATUS DETAILS
Needs Votes
Ideas Administrator

Thank you for your feedback. Currently this is not in our roadmap; however, we are tracking it and if we get more feedback and votes, we may consider it in the future.

Sincerely, 

Beatriz Nebot Gracia

Program Manager, Microsoft