Unable to get shared calendars to work in Outlook for Mac

Hello! I understand you are having issues getting shared calendars to work using Outlook for Mac. From your comment above, it does seem that it is working when using the Workmail Web client. Can you confirm this?

Also, can you please let me know how you configured the account in Outlook? Do you have the autodiscover DNS record created in your domain to allow for easy configuration of Outlook? https://docs.aws.amazon.com/workmail/latest/adminguide/autodiscover.html

Have you configured Outlook as an Exchange account as mentioned in our documentation? https://docs.aws.amazon.com/workmail/latest/userguide/outlook-client.html#connect-outlook-client

If the answer to all questions above is yes, can you provide a screenshot with any error message that you are receiving? We might need to perform additional troubleshooting with you. I would suggest to open a new support case with Premium Support so that we can gather additional information from your account and domain, as this is a public forum.