O365 Shared mailbox read only delegation

When we called Microsoft to report that below article in not working, we were told that Read Only delegation when it comes to shared mailbox in O365 is not supported. At the same time we can see articles from MS that says this is supported in Exchange online. Just wanted to know if you were able to get it to work in your environment.




https://docs.microsoft.com/en-us/powershell/module/exchange/mailboxes/get-mailboxpermission