When starting a Lync group message from a Mac, anyone else using a Mac cannot see the first message.

When a group conversation is started from a Mac, any other Mac user will not see the first message unless they reply to the message immediately.  Here's what I've tested:
Mac User 1 starts a group conversation with 4 people invited.
Mac User 2 sees the popup but does not immediately open the conversation window.
PC User 1 opens the conversation window and sends a reply.
PC User 2 opens the conversation window and sees all the text.
Mac User 2 finally opens the window about 30 seconds later and can see all text except the first message.
Why does the first message disappear for Mac User 2?  
Note:  This does not happen if the original message was started from a PC, in that case Mac User 2 would be able to see the first message.
Thank you for any help.

Hi,
Did the issue happen only for single Mac computer or for multiple computers?
Please try to login Lync client on another Mac computer with the same Lync account and test again.
Please also try to login Lync client on the issued Mac computer with other Lync account and test again.
Please check if the Lync client on Mac computer update to the latest version, if not, please update to the latest version.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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