Addresslist and resource mailboxes in exchange 2016 and exchange online Hybrid environment

Requirement:

In Hybrid environment to create an address list and add resource/Room mailboxes, should be visible/available to both on premise and cloud users in their address book.

Issue:

A single address list (created on premise OR on exchange online) would not be enough. as if created on exchange on premise then will be only visible to on premise users 

OR

if created on Exchange online then will be only visible to Exchange online users.

Same is the case with resource/room mailboxes, if created on exchange on premise then will be only visible to on premise users OR if created on Exchange online then will be only visible to Exchange online.

Solution:

i had to create 2 address lists with the same name, one on Exchange on premise and one on Exchange online.

the case with room/resource mailboxes was a bit change, even that the on premise room mailboxes were not appearing to the cloud users in their address book but while scheduling the meeting they were able to see the free/busy of  the on premise resource/room mailboxes.

same was the case with exchange online migrated room mailboxes,  were not appearing to the on premise users in their address book but while scheduling the meeting they were visible and their free/busy were also appearing to the on premise users.