Hello Andrew,
Thanks for your question.
The Office 363 E3 does not come with the Entra P1 (Plan 1) license. See the official PDF of the various license comparison (I put a snippet of the entra P1 section for you). You can take a look to compare features:
Microsoft 365, Office 365, Enterprise Mobility + Security, and Windows 11 Subscriptions
Please let me know if you have further questions**
You can mark it 'Accept Answer' if this helped you