Problem:

Security groups do not support assigning the user to a company (User Groups (soon to be obsoleted) did support this)

Issues:

1. Having to maintain and setup multiple security groups that do the same thing as a single User group. Changing a permission sets for a 'job role' means updating permission sets across multiple security groups.
2. Gets messy in Office 365 with all the security groups it introduces when we have lots of companies

Suggested Solution:

Have functionality for assigning users to a company within a Security group, permissions will sit at the group level.