How to view multiple Microsoft “filter” calendars on my Android mobile phone? Only one calendar appears.

My Microsoft account (Hotmail) calendar includes a dozen separate "filter" calendars, which I like to use.  (These "filter" calendars were created in Microsoft account under Settings / Options / Add a new calendar.)  I have synced my Android mobile phone calendar, in order to view the dozen Microsoft filter calendars.  However, the Android mobile phone calendar shows only one Microsoft calendar:  "Matthew's calendar" (and not "Original calendar" or any of the dozen "filter" calendars).  Why can I not see the many separate "filter" calendars that I created in my Microsoft account?