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I think the most likely reason is, as Tomas suggests, that the file hasn't been deployed for some reason but, if the file is there and you're still getting a 404, it could be an issue with mime type mappings. If you're on .net 4.x, you can add a mapping for the file type in web.config like this:
<staticContent>
<remove fileExtension=".json" />
<mimeMap fileExtension=".json" mimeType="application/json" />
</staticContent>
If you're on .net >= 5, you'll need to add your mapping in your startup class using app.UseStaticFiles.
I am working on a .Net application comnined with Optimizely CRM. i would like to access a json file like
www.abc.com/.well-known/assetlinks.json
but i can able to accress from local like
https://localhost:44300/.well-known/assetlinks.json
but wehen i try to deploy in the test environment i get this error
www.abc.com/.well-known/assetlinks.json
404 not found
Any help would be highly appricited.