O365 users cannot see free/busy information of On-Prem users

Good day

We have a hybrid solution  setup between our On-Prem MS Exchange (2010) and O365. We have one problem where O365 users cannot see the free/busy information of any new domain added to the On-Prem Exchange (See attached). All the other domains we have and that were setup when the hybrid solution was deployed, still work fine (we can see free/busy). This only happens with new domains we setup for email.

Please can someone point me in the right direction to have this issue resolved?
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
How is free busy set up between both forest?  Federation trust or Org relationships?

Whatever method is, you need to re-do the configuration to include newly added domain.

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iamdieterAuthor Commented:
Will give it a go and run a sync. Will let you know how it goes.
Hasin Ahmed ChoudharyExchange AdministratorCommented:
I have replied to answer
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