The requirement to access your BitaBIZ Outlook add-in, is that you must click your "inbox" in Outlook and have an email active in the reading pane:

If your BitaBIZ Outlook add-in does not appear when you are in your inbox...

Then it is because you have disabled "Reading Pane" in your Outlook.

In this case, you gain access by opening an e-mail in your inbox.

Or by enabling "Reading Pane" as shown in the image below.

Click: View > Reading Pane > select "Right" or "Bottom":

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