Issues sending Zoom meetings, some attendees receiving the invite as email not calendar invite.

[JasonWinsor]

Hi.

I have a user that has the Zoom Workplace Business license and has created many invites using the Zoom plug in for Outlook for several years with no issues. However, recently, he sent an invite out to approximately 50 people for a single meeting and about 10% have reported that they received the invite as an email and not a calendar invite plus it didn't include the time or date of the meeting so they couldn't add it manually.

The user is using Outlook 2019, with the latest updates, the latest Zoom connector and the recipients are using either Outlook 2019 or Outlook for 365. All users are on the same M365 tenancy.

Any advise on resolving this?

Thanks.