Hi K Varghese,
I would like to confirm the following information with you:
1. Have you finished the Service Upgrade? If yes, does this issue occur after the Service Upgrade?
2. Is there any error message when being unable to log in to Lync?
3. Does this issue occur to some certain users or all users in your tenant?
Also, please provide the log information via the private message. I have sent you a private message with the subject “Information Request”. Please follow the steps below to reply to it:
• Go to your details section on the right side of the community site.
• Click Private messages.
• Click the subject title of the response to read the message.
• You can reply by using the form in this display.
• Click Submit Reply.
Thanks,
Allen Zhang