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I came across an article which explains that the ringcentrals features enable us to schedule and host multiple meetings and at the same time switch them between lines. I have not yet tried this out to help you with this more but you can check out this link for more info on what can be done, which can be helpful.

https://support.ringcentral.com/s/article/6294?language=en_US

Here is a little secret... meeting IDs are very portable and can really be used or re-used by any extension. That little tidbit may prove useful if you just need a quick hack.

That being said, have you tried updating the target meeting and change the Host ID to the new owner? I strongly suspect that will cause the following:

1. Create Meeting A by User B.
2. Create Meeting B by User C.
3. Change Host of A to C.
4. Now when you get list of meetings for C, it should return A and B.

Try that and confirm that works. If not, we will continue our investigation.