In your version of SQL Server, you cannot use the form
DECLARE @myvar varchar(100) = 'Some Value';
You have to use two statements, one to DECLARE then a SET.
DECLARE @sqlquery VARCHAR(100);
SET @sqlquery = 'select * from Table where ID=@ID';
Next problem is that the sp_makewebtask proc knows nothing of your variable @ID...
So try this instead:
DECLARE @sqlquery VARCHAR(100);
SET @sqlquery = 'select * from Table where ID='+CAST(@ID AS VARCHAR(20));
This will create a query like this to pass to the sp_makewebtask:
select * from Table where ID=12345
MM
select geometry::STGeomFromWKB(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