Microsoft 365 Developer E5 license lacking endpoints and device ON defender portal

Cannot see Endpoints/Devices in security.microsoft.com, also wants Sentinel, has separate Azure and M365 tenants.

Your licensing is actually fine, Developer E5 includes Defender for Endpoint Plan 2. The Endpoints and Devices areas look missing for two reasons that catch a lot of people on dev tenants.

One, the Devices list only populates after Defender for Endpoint is provisioned and you have onboarded at least one device. Go to Settings, Endpoints in the Defender portal, the first visit triggers the service to provision (it can take a little while), and then onboard a test Windows 10 or 11 VM using the onboarding script from Settings, Endpoints, Onboarding. With zero devices the section reads as empty, which looks like it is not there. On dev program tenants the MDE workload sometimes also needs that first manual visit to wake up.

Two, Sentinel is the bigger blocker. Sentinel needs an Azure subscription, and the Microsoft 365 Developer program does not include one. That is why you cannot stand it up. You will need to add an Azure subscription (a free trial or pay as you go works) and create a Log Analytics workspace, then enable Sentinel on it and connect Defender XDR with the data connector.

On the two tenants point, that split is exactly what is making this painful, and the unified Defender XDR plus Sentinel experience really wants to live in one tenant. The cleaner path is to add the Azure subscription under the same Entra tenant as your M365 dev tenant rather than keeping Azure in a separate directory. You can associate a subscription to that directory, and then identities, Defender data and Sentinel all line up.