How to troubleshoot the sync failed issue in DevOps deployment?

After i push the change from local to Github, then i click on the sync button in the deployment center.

How the status indicated that the sync result is failed. we can check the issue by click on the Log button to expand the log section.

Command: "D:\home\site\deployments\tools\deploy.cmd"
Handling ASP.NET Core Web Application deployment.
D:\Program Files (x86)\dotnet\sdk\2.2.109\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets(137,5): error NETSDK1045: The current .NET SDK does not support targeting .NET Core 3.1.  Either target .NET Core 2.2 or lower, or use a version of the .NET SDK that supports .NET Core 3.1. [D:\home\site\repository\DanCoreWebApp\DanCoreWebApp.csproj]
D:\Program Files (x86)\dotnet\sdk\2.2.109\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets(137,5): error NETSDK1045: The current .NET SDK does not support targeting .NET Core 3.1.  Either target .NET Core 2.2 or lower, or use a version of the .NET SDK that supports .NET Core 3.1. [D:\home\site\repository\WebApp2\WebApp2.csproj]
Failed exitCode=1, command=dotnet restore "D:\home\site\repository\DanCoreWebApp.sln"
An error has occurred during web site deployment.
\r\nD:\Program Files (x86)\SiteExtensions\Kudu\85.11214.4277\bin\Scripts\starter.cmd "D:\home\site\deployments\tools\deploy.cmd"

the error log showed that .Net Core version issue. Currently Azure does not support the .Net Core 3.0 in the production.