Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve products/app/releasedAssets/css/build-15dd158a413a2954ec66.css, which is not a DOI.
products/app/releasedAssets/css/build-15dd158a413a2954ec66.css may be a Handle (DOIs are a special sort of Handle). If products/app/releasedAssets/css/build-15dd158a413a2954ec66.css is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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