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Question about Exchange Hybrid Mode

Hello experts

 I have a Customer  who tried to activate the Hybird Mode by himself but things did not go well

He did the Ad connect step but gave the Licences to users in Office 365 . this activated mailboxes in O365  with his current domain name . So Now the situation is you have mailboxes On premisses and a different mailboxe Online

Is it still possible to setup a hybrid mode with this setup?

Rgds
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Most Valuable Expert 2015
Distinguished Expert 2019
Commented:
Yes, perfectly possible. If you want to get rid of the O365 mailboxes, there are several methods. If they arent using any other O365 services, simply hard-delete the users, the will be recreated on the next sync cycle and you can start fresh. If they are using other services, you can either disable the Exchange license and wait 30 days, or speed up the process by using one of these methods:

https://blogs.technet.microsoft.com/exchange/2018/01/17/permanently-clear-previous-mailbox-info/
https://www.michev.info/Blog/Post/2388/permanently-disable-a-mailbox-in-office-365
Gaston MbeyIT CONSULTANT

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Commented:
thank you Vasil