Calendar partial syncing between eMClient and Workmail

I have eMClient installed on my MacBook Air 2022 and a PC running windows 11, I have another email client (Bluemail) on my Android phone.

I cannot get calendar entries created on my Mac to sync with AWS Workmail via EWS but I get entries created in either of the other devices or on the webmail client for Workmail. I enabled diagnostics but cannot see anything to indicate where the problem is occurring. But it seems to be the sync from eMClient on Macbook because all the other devices seem to sync ok.

Any assistance please?