From the description, I understand that you would like to consult Microsoft Office 365 E3 assignment and price with Intune. Please correct me if anything is misunderstood.
If so, Each user that you assign a user software license to may access and use the online services and related software (including System Center software) to manage applications and up to 15 MDM devices. The Intune PC agent allows 5 physical and 1 virtual machine per user license. Also, you can purchase licenses for any devices separately from user licenses. Device licenses do not need to be assigned to the devices. Each device that accesses and uses the online services and related software (including System Center software) must have a device license. In additional, if a device is used by more than one user, each requires a device software license or all users require a user software license.
Refer the following link to assign the license in Intune: https://learn.microsoft.com/en-us/mem/intune/fundamentals/licenses-assign
For Microsoft 365 e3 pricing, you can contact sales for latest discount price.
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