On 10/2/20, Carolyn Odio and I tried using the host key, which is available on your Zoom profile. 

1. I sent her a link to a new meeting with a passcode and without recording enabled.  I gave her my host key ahead of time. 
2. She joined before the meeting started, and was able to get AVA going and start recording. 
3. I then joined the meeting. 

Side note:
4. She made me host and left the meeting. (We wanted to see if AVA would continue captioning even though she was the person who started the captioning.) And it did.