My issue was initially due to an integration with a new CRM. I worked with the support team at Zoom and they were able to resolve it. It took some troubleshooting, but everything has been working perfectly for the past 3 months. I have the communication threads saved. I believe this is what ultimately fixed the issue:
Can you please go to this link https://us02web.zoom.us/profile/setting and disable Personal Meeting ID (PMI) Passcode. Also, disable the same feature on this link https://us02web.zoom.us/meeting#/pmi/9254513183.
Once done, you may lock the setting under your account settings - https://us02web.zoom.us/account/setting and then logout and log back in to your zoom app, calendar integrations and 17hats as well.
17hats is the CRM we use, which is why you see it referenced above. I hope this helps!