Please feel free to leave this request open until you confirm
sos works under strict confinement. You can use snappy-debug to get suggestions/understand missing interfaces and denials. If you run into problems, post the snappy-debug output here along with your questions and we are happy to help.
Please remember classic snaps are not installable on Ubuntu Core devices and also run in the global mount namespace, which means great care must be taken for the snap to work reliably across distributions. If you can make
sos work under strict confinement, you will enjoy all the benefits of a stable runtime environment.