This affects only those users who are using the SMS service and get the certificate needed in VPN connection as a text message to their telephone. During the maintenance breaks the service does not send these text messages.
The certificate which is received as a text message is usually used for the strong authentication in Pulse Secure client and VPN portal.
These maintenance breaks will not affect your VPN connection if you use the OpenVPN client or the light authentication in VPN portal.
Last updated: 1.12.2020