Further to https://pjlee.net/blog/upgraded-this-site-to-net-9-but-not-the-associate-function-it-seems-that-net-9-cannot-be-used-with-f, I have upgraded the site from .NET 9 and the associated function from .NET 8 to .NET 10.  

The process was relatively straightforward: as well as changing the .csproj files, I also had to upgrade various Microsoft nuget packages. Note that for the function I couldn't upgrade Microsoft.ApplicationInsights.WorkerService to 3.0.0 but only to 2.22.0 because it seems that the .NET 10 functions are not yet compatible with Microsoft.ApplicationInsights.WorkerService 3.0.0.