Dynamics 365 App for Outlook on Macs (Dynamics 9)

I have a client who has recently gone live with a Dynamics 365 CRM solution running on Version 1612 (9.0.0.3172) (DB 9.0.0.3172) online. They have a fleet of Macs and I intended to use the Dynamics 365 App for Outlook in order to sync email from Outlook (on the Mac) to Dynamics. During the specification process, I used the compatibility matrix (https://blogs.msdn.microsoft.com/crm/2016/12/13/dynamics-365-app-for-outlook-support-matrix) to confirm that this was all achievable. 

I've since set the system up and learnt that in the rollout of Dynamics 9, the Dynamics 365 App for Outlook has been "set back" to be a preview feature and no longer supports Macs (https://docs.microsoft.com/en-gb/dynamics365/customer-engagement/outlook-app/deploy-dynamics-365-app-for-outlook). I have enabled the preview and pushed the app, it does appear in users' Outlook but gives an error. The error reads as "Error: AppforOutlookModule was not found, empty appId returned" 

I have tried using OWA in both Chrome and Safari (on the Mac) and this did not work. The error show says "Sorry, something went wrong while initializing the app." 

I've now got a client looking for the ability to link emails into Dynamics but I can't find a way to do this. I'd welcome any suggestions or insight when the D365 App for Outlook will support Macs (there's nothing I can see on the roadmap).

Thanks 

David