Configuring preferences and options in Outlook.com
Adding events this way.. DOES NOT GUARANTEE it also adds them to other devices like your phone.
If I add my ics files this way in outlook
They DO NO show up on my phone or tablets calander. Just on my laptop.
I even tried switching accounts.
MS Outlook adds it to my Samsung Calander (******@gmail.com). My phones main account/calander. When it really needs to add it to the GOOGLE account (yses the same ******@gmail.com account, bit for google/all devices, not just samsung's acct.) I HAVE S23 ULTRA. MS WINDOWS11 24H2 HOME.