HELP with adding a co-host!

Hello all! I need your help with the following, I am the Zoom account holder and host of a very important meeting tomorrow - Wednesday 14th of August at 12pm EST.

I've tried to assign a co-host because I am in the Caribbean right now and we are under threat of a tropical storm and I might lose power.

I am trying to assign to "EDIT" the meeting and add my friend, but I get an error message saying: "Unable to assign XYZ.com as an alternative because the user cannot be selected at this time."

Can you help please?

Thank you!