Entity Framework Core in ASP.NET Core 3.1 Scaffold-DbContext when using named connection from appsetting - asp.net-core-3.1

Question

I am writing an ASP.NET Core 3.1 class library to Scaffold-DbContext to reverse engineering the tables into models.
It is throwing an error
Format of the initialization string does not conform to specification starting at index 0
if I use the connection string directly instead of -Connection it work without problem, but trying to understand what is that I am not doing correctly?
{
"DetailedErrors": true,
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"ConnectionStrings": {
"DatabaseConsString": "Server=tcp:mysqlserver.database.windows.net,1433;Initial Catalog=mysqldb;Persist Security Info=False;User ID=XXXXX;Password=XXXXXX;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;"
}
}
The above is my appsetting.json file, and this is the command I use:
PM> Scaffold-DbContext -Connection Name=DatabaseConsString
Microsoft.EntityFrameworkCore.SqlServer -OutputDir DbModels
-Context myDbContext -UseDatabaseNames -Force
-Tables [dbo].[UserInfo],[dbo].[Transactions]
Build started...
Build succeeded.
System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0.
at Microsoft.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyvalue)
at Microsoft.Data.Common.DbConnectionOptions.ParseInternal(Dictionary2 parsetable, String connectionString, Boolean buildChain, Dictionary2 synonyms, Boolean firstKey)
at Microsoft.Data.Common.DbConnectionOptions..ctor(String connectionString, Dictionary2 synonyms)
at Microsoft.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
at Microsoft.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
at Microsoft.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(DbConnectionPoolKey key, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
at Microsoft.Data.SqlClient.SqlConnection.ConnectionString_Set(DbConnectionPoolKey key)
at Microsoft.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
at Microsoft.Data.SqlClient.SqlConnection..ctor(String connectionString)
at Microsoft.EntityFrameworkCore.SqlServer.Scaffolding.Internal.SqlServerDatabaseModelFactory.Create(String connectionString, DatabaseModelFactoryOptions options)
at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineerScaffolder.ScaffoldModel(String connectionString, DatabaseModelFactoryOptions databaseOptions, ModelReverseEngineerOptions modelOptions, ModelCodeGenerationOptions codeOptions)
at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String outputContextDir, String dbContextClassName, IEnumerable1 schemas, IEnumerable1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String outputDbContextDir, String dbContextClassName, IEnumerable1 schemaFilters, IEnumerable1 tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_01.b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Format of the initialization string does not conform to specification starting at index 0.