MicrosoftTo be precise, a Technical Support Engineer (Microsoft Project and Planner Technology, Customer Experience & Support) replied to my support ticket and said, the PWA site collection will not be deleted, however only the SharePoint Online data will be accessible to customers. All data in SharePoint Online, such as SharePoint Enterprise Content Types, Power Automate flows, and SharePoint Lists apps, will continue to exist within the PWA site collection and environment. Additionally, all related Power Automate flows or Power Apps will remain available in the default environment, as long as they do not reference the https://learn.microsoft.com/en-us/connectors/projectonline/ (Project Online) connector or use any Project Online functionality.
Based on everything Microsoft has said so far, after 30 September 2026 you should assume the following will no longer be available.
PWA site
Project Center
OData feed
Enterprise Resource Pool
Project sites
SharePoint lists and libraries under the PWA site
That means anything under /sites/pwa should be treated as lost unless it is extracted or migrated beforehand.
In practical terms, access to the PWA root site is being switched off. That is effectively how Microsoft will remove access to PWA.
I believe the Tech Support Engineer was mistaken or at least provided misleading information.
The more likely technical reason PWA sites disappear is that the underlying Project Service, Queue, and Reporting Database architecture is being removed. Once those components go away, it becomes difficult to see how the SharePoint site could realistically remain accessible.
Project Sites may look like normal SharePoint sites, but they are tightly bound to PWA objects.
Each project site is linked to a Project UID, the project workspace provisioning job, PWA permissions synchronisation, and Project Server security groups.
These relationships are stored in the Project databases.
If those disappear, SharePoint cannot resolve project security, the provisioning relationship breaks, navigation links break, and PWA permissions can no longer synchronise.
For that reason Microsoft removes the entire PWA environment.
