Pulse Secure clients stop working after upgrading the version on the firewall from 20.4 to 21.4

1. Unable to find show/clear commands under dynamic-vpn hierarchy.

2. Unable to edit the configuration under 'edit security dynamic-vpn' hierarchy.

3. Dynamic-vpn feature license is missing in the 'show system license'

Deprecated Dynamic VPN CLI configuration statements and operational commands (SRX Series Devices)—Starting in Junos OS Release 21.4R1, we’ve deprecated the dynamic VPN remote access solution, this means that you cannot use Pulse Secure Client on these devices.

• Use the Juniper Secure Connect remote access VPN client we introduced in Junos OS Release 20.3R1 as an alternative.
• Juniper Secure Connect is a user-friendly VPN client that supports more features and platforms than a dynamic VPN.
• Please refer to the following document for more information on Secure Connect 
  • Juniper Secure Connect | Junos OS | Juniper Networks