Hello, I am using Office 365 for Mac.  Using Outlook, I have two different email accounts.  I set up a different default signature for each.  (There are no graphics in the signatures).  When I open a new email it will be from one of my accounts and the correct signature will be shown.  But when I switch the account the signature does not automatically change to the signature that is supposed to be the default for the other account, although I know it is supposed to.  How can I fix this?