So it looks like the Public preview is restricted to users with the following License:
https://docs.microsoft.com/en-us/microsoft-365/compliance/endpoint-dlp-getting-started?view=o365-worldwide#skusubscriptions-licensing
Before you get started with Endpoint DLP, you should confirm your https://www.microsoft.com/microsoft-365/compare-microsoft-365-enterprise-plans?rtc=1 and any add-ons. To access and use Endpoint DLP functionality, you must have one of these subscriptions or add-ons.
- Microsoft 365 E5
- Microsoft 365 A5 (EDU)
- Microsoft 365 E5 compliance
- Microsoft 365 A5 compliance
- Microsoft 365 E5 information protection and governance
- Microsoft 365 A5 information protection and governance
In my Test Tenant i don't see "Devices" under DLP Policies. But there i have only "Microsoft 365 E5 Developer" licenses in place. So will these licenses also get the feature?