Adding alternate host to daily meeting that started 2 years ago

Hello! I have a Zoom meeting I set up 2 years ago. I now need to add an alternative host. Two issues: one, it no longer appears on my upcoming or previous meeting tabs, even though it shows up each day in my calendar (so I can start it). 2) When I try to add alternative host to that meeting from my calendar, I get the error message that the meeting doesn't exist (even though it exists every day). 

Anybody have any ideas for how to add an alternative person to an ongoing meeting with these issues? I'm going to be away from my regular meeting and need someone else to start/host.

I really don't want to simply recreate the meeting and send out a new invitation to all - since people don't join all the time, I don't even know how I'd track them down at this point.

Thank you!

Jana