How to edit Exchange atributes for O365 users that are synced to the cloud with Azure AD Connect

in this scenario O365 objects are read only, how do I add for example email alias on prem AD?
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Vasil Michev (MVP)Commented:
The supported way is via Exchange on-prem tools. If you dont have Exchange on-prem server, you can install and use the Hybrid edition for free:

The not-so-supported, via ADSIEdit/attribute editor. Extending the schema with the Exchange attributes is one thing to consider as well.
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