Hi Elroy,
I’d like to collect some information from you:
1. Which plan are you using? Have you upgrade to the latest version of Office 365?
2. Is the email address used by other user an internal email account or an external email account?
3. Would you like the emails sent to other email addresses to be received in this mailbox?
If the answer to question 3 is yes, setting up forwarding can surely meet your needs. Otherwise I am glad to find the solution according to your situation.
Thanks,
Henry Huang