Поддержка .NET Core 2.1 будет прекращена 21 августа 2021 г.
https://devblogs.microsoft.com/dotnet/net-core-2-1-will-reach-end-of-support-on-august-21-2021/
#End #of #Support
https://devblogs.microsoft.com/dotnet/net-core-2-1-will-reach-end-of-support-on-august-21-2021/
#End #of #Support
Microsoft News
.NET Core 2.1 will reach End of Support on August 21, 2021
Update your apps to a supported version of .NET Core as .NET Core 2.1 will be reaching end of support on August 21, 2021.