Copy E-Mail to another inbox

We use Outlook for Mac Version 16.84.1. Since a while it is no longer possible to move or copy an e-mail from a shared mail account to the personal account. When i drag and drop an e-mail from our info@... account, which is a shared account in office, to my personal account, it says the the message has been copied, however, it does noch appear in my personal inbox. If i do it the other way around, move a message from the personal account to the shared account, it does work. I did not find any information abut the problem online. 

Best regards 

Stefan