Hi redhonker
I understand why this is confusing, especially since the Outlook.com account shows normally, while the Hotmail account does not.
Another important point from Microsoft is that calendar and contacts will not sync if an account is set up as IMAP or POP. If you re-add the Hotmail account, it needs to be added as the normal Outlook.com / Exchange ActiveSync type so calendar data is available.
Since Samsung Calendar can already see both calendars, Outlook is already exporting the Hotmail calendar to the Android calendar provider. Please try the following steps:
- In Outlook for Android, go to Settings.
- Tap the Hotmail account that is not syncing correctly.
- Select Reset Account.
- If that does not help, remove only that Hotmail account from Outlook and add it back again, making sure it is added as Outlook.com/Exchange, not IMAP/POP
For more details, you can see this official guide: Can't sync calendar and contacts with my phone or tablet
Please feel free to let me know how it goes. I truly appreciate your time and understanding.
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