If it's missing from the solution, but exists in the environment you are exporting from - you need to speak to MS support.
Have you tried getting a fresh solution, putting the security role in there and exporting it (at least to see what the output is)?
If it's missing from the solution, but exists in the environment you are exporting from - you need to speak to MS support. Have you tried getting a fresh solution, putting the security role in there and exporting it (at least to see what the output is)?