User A was in the organization. User B is a new user. User B took over User A's role. I originally renamed User A to User B, but decided to create a new account and import User A's pst into User B's mailbox. Deleted User A's account.
When User B modifies a calendar entry that was originally created by User A, they are able to send updates, but receive a NDR stating they do not have permission to send on behalf as.
Is there a way to give user B send as rights to a deleted account. Or take full ownership of the calendar entries. Or clean up the references to User A in these entries. I have seen posts on how to delete them, but the User B will need these for day to day operation.