These problems are specific to using the OpenAI library via an intermediate class library targeting netstandard2.0; in that case, the multi-target is causing the executing project to pick up the uplevel framework target that's incompatible with downlevel intermediate library.
Although there may be other approaches to mitigate, it seems reasonable to not expressly multi-target net6.0 if netstandard2.0 is sufficient.
As described at: https://github.com/Azure/azure-sdk-for-net/issues/44709
These problems are specific to using the OpenAI library via an intermediate class library targeting
netstandard2.0; in that case, the multi-target is causing the executing project to pick up the uplevel framework target that's incompatible with downlevel intermediate library.Although there may be other approaches to mitigate, it seems reasonable to not expressly multi-target net6.0 if netstandard2.0 is sufficient.