Hi @WD ,
Welcome to our forum!
According to your description, I have done research on the outlook anywhere notification "TAKE YOUR OUTLOOK ANYWHERE". It's suggested that you could try JadeLiang-MSFT's reply in this thread to turn off the option "Turn on optional connected experiences"(File>Options>Trust center>Trust center settings>Privacy option>Privacy settings>uncheck Turn on optional connected experiences) and check if there're any differences.
Hope the above help!
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