Declined Calendar Invites Keep Showing Up?

I have a Microsoft 365 account from my job linked to my iCal. On my Macbook Air (Sequoia 15.6), when I decline a calendar invite from that 365 account, it still shows up on my calendar anyway, even though I've indicated in the settings (both in iCal and in 365) that I don't want it to show declined items. My organization sends out blanket invites, which means that currently, every single calendar item for everyone in my whole organization is showing up on my iCal and I can't remove the things I don't need-- it's so saturated that it's unusable. How can I get it to stop showing declined events? It won't even hide them in my view.