I download the Microsoft 365 and I get Lync. how can I made an account for it? I try to login with my msn username and password since it was a Microsoft product but never work.

Hi,

Microsoft Lync Server is an enterprise real-time communications server. The Lync client is used to connect Lync Server. The Lync client is only meant to be used with a Lync Server (hosted in a corporate environment) or an account hosted on Office 365 with Lync functionality enabled. After you doing that you can create a user on Lync Server and login to Lync Server with Lync client.

In your case, you can't use MSN account, if you want to use Lync online, you can refer to the link below:

https://products.office.com/en-us/lync/lync-online-overview-and-features-online-meetings-and-instant-messaging

Best Regards,
Eason Huang