In case you want to give a user from your company access to specific saved audiences, you can easily use our label system!
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First, go to to your Audience library and label the saved audience you want to share.

Then, invite the new user with a Custom role. Make sure you tick the box "Can use saved audiences". He will then have access to the audience library in the campaign creation flow.
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Finally, at the bottom of the list, you can give access to all the saved audience that were labeled a certain way by ticking "Saved audiences : limit access to the following audiences".
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There you have it!