As above, I too have issues with Outlook Mobile regarding footy calendars (sorry, guys, West Ham & Norwich!). I was on Outlook Mobile v 4.2432.0 (now upgraded to v 4.2434.1 and still same situation) on Android and all calendars were 'checked', but no details showed. On looking back, the last event entry was in May 2024 (last season). These were sync'd to my Samsung calendar ok. This season...nothing, nada.
I checked back on my laptop...MS365 inserts the calendars individually, but show no events. And they're not integrated in my primary calendar. New Outlook and Classic show them as checked, but they don't get included. I raised a ticket with Calendar support, who finally told me it must be a server side issue, as all Outlooks are mirrored from there and I should contact Outlook.com support. I've tried this today, but not heard anything yet.
1 other thing; earlier this year I 'lost' all my anniversaries e.g. birthdays, insurance renewal dates etc etc. but only found out by accident. I think a version of Outlook after May 2024 may be the culprit, no idea which.
It's not a major issue, in a world where lots more major things are happening, but it is annoying, and begs the question: what use- cases are set up for their testing!
Kind Regards, PK.