I have tested the ability for non-PWA subscribed users to access Project Online team sites with their Office 365 Enterprise (SharePoint Online) subscription.
Scenario:
We have Project Team sites that need to be shared beyond the PWA licensed user base. These non-PWA users have Office 265 (SharePoint Online) subscriptions set as part of our Enterprise agreement. I was told that user access is restricted to PWA subscribed
users only (Lite, Online, Pro...), but have tested and found that is not the case. i.e. I can Invite a non-PWA user to a team site and they are placed in thesitename Team Members (PWA Synchronized) Group. They can access the site, contribute content, etc. all without a PWA license.
When a project team site is created, several default groups (Team members, Readers, Admins...) are also created. My assumption was that the groups specified with "(PWA Synchronized)" suffix were synchronized with the AD group associated to
the PWA Setting for Team Members under 'Manage Groups'. After 3 days of nightly synchronizations, the site group remains unchanged, and has only the 4 non-PWA users I invited or shared-with.
UPDATE:
I opened the project, added a resource, published. Then, it synchs and wipes out my 'invites' and 'shares' and replaces with Synched users.
Considering adding users to non-synched groups via a scripted process to add and AD group to the Readers group.