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SMTP-addresses not in sync with AD
We have an AADSync enabled tenant syncing the users to Office 365 and have ADFS running. We have NO Exchange hybrid setup. Mailboxes are on-premises Exchange.
I accidently created for some users a ...
You should be able to use the -WindowsEmailAddress parameter for this. The new address you specify should be set as the Primary SMTP, while the old primary one will be kept as secondary. The cmdlet will also work against synced users.
If that's not a viable solution for your scenario, you can force-delete the mailbox in O365 and provision the object anew. Use the method outlined here for fastest resolution: https://blogs.technet.microsoft.com/exchange/2018/01/17/permanently-clear-previous-mailbox-info/
I just disabled the Licence of "Exchange Online". In local AD the property is set correct, so adding is not possible. I also tried to remove the adress in local Exchange, sync and add it again. Didn't work.
By disabling the license you are not removing the mailbox
Please refer to the article I posted in order to permanently delete EXO mailbox