Today I noticed that I had not received any external mail. I tried mailing myself, but it did not get through to our on-premises mail server. I checked EOP, and there I was in the mail box list. I had disappeared from the contact list. I tried renaming the mailbox, but that did not work. After removing the mailbox, I could add a contact. Mail flow was successfully restored. I have two questions:
How did this happen? I have been trying to use my work account for Teams instead of my personal account. Could something I did there caused this.
Is it possible to recover the contents of the removed mailbox? (This was less important than restoring mail flow)