System.InvalidCastException: 'The SqlParameterCollection only accepts non-null SqlParameter type objects, not SqlParameter objects.'

Fixed by changing using System.Data.SqlClient to using Microsoft.Data.SqlClient

https://github.com/aspnet/EntityFrameworkCore/issues/16812#issuecomment-516013245

This code worked after replacing

System.Data.SqlClient.SqlParameter

to

Microsoft.Data.SqlClient.SqlParameter

and

FirstOrDefault();

to

ToList();