Because of the way that the Skype for Business Online service generates meeting URLs, any meetings that were scheduled by using the old Skype for Business Online SIP address must be rescheduled. Reschedule Skype for Business Online meetings.ProcedureĪfter the user ID of a Skype for Business Online user is updated, there are some actions that the user must take to make sure that the service continues to work without any interruptions. A mismatch between a user ID and the user's SIP address may cause confusion for the Skype for Business Online user during sign in. Otherwise, the two values would be mismatched. Previously, when a user's Microsoft 365 sign-in address was changed, the IT administrator had to update the user's SIP address separately to match the new Microsoft 365 sign-in address. When a user's Microsoft 365 sign-in address (also known as the User Principal Name, UPN, or user ID) is changed, the Skype for Business Online (formerly Lync Online) SIP address for the user is automatically synchronized.

How to change skype sign in name