Broken Meeting Invites Sent with Outlook Plug-In

I used to send calendar invites for Zoom meetings using my Outlook plug-in without issue, connected to my hotmail.com account. I while ago, it started mysteriously sending my invite emails to people's junk folders. But now, my invites are not even reaching there.

I just tried to schedule a Zoom meeting this way that it failed because my participants never got the invite. Despite the plug-in confirming that my invite was sent, seeing the invite with Zoom link show up in my own Microsoft calendar, and that calendar item showing the emails of the people I sent the meeting invite to, they deny seeing the invite in neither their inbox nor their junk folders. How can I fix this issue?