I get the error:
failed to solve with frontend dockerfile.v0: failed to create LLB definition: no match for platform in manifest
when building the following Dockerfile:
FROM mcr.microsoft.com/dotnet/framework/aspnet:4.8
COPY . /inetpub/wwwroot
The cause was simple. I had my Docker desktop running on Linux containers and the image was build from a Windows image.
Simply switching to Windows containers solved the problem.
The message is clueless, so I hope this save some time for others.