take a look at this
https://techcommunity.microsoft.com/t5/security-privacy-and-compliance/new-enhancements-to-office-365-message-encryption/ba-p/1034664
using "Encrypt Only" in outlook would take care of emails including the ones with Office attachments. In addition now there's a support for PDF documents (as described in above article).
Hi,
I created the policy on the Azure Information Protection in the Azure Portal for Legacy client and I created the policy in Office 365 Portal for Unified Label too.
Thank you for reply.
Kind regards,
Federico