Don't forget to update older client applications for Dynamics 365 to the correct .NET Framework version

I lost 30 minutes this morning when trying to troubleshoot an older console app (written in 2017) which refused to connect to Dynamics 365 Customer Engagement. It was only after updating the Nuget packages for Microsoft.CrmSdk.CoreAssemblies  that I noticed that I was still building against .NET Framework 4.5.2 which is not supported anymore.

Reference:

• Visual Studio and the .NET Framework (Dynamics 365 Developer Guide)