error message "Provider error occurred, code: 0. The underlying connection closed. The connection was closed unexpectedly."

Unable to activate the license on SDL license manager.

error message "Provider error occurred, code: 0. The underlying connection closed. The connection was closed unexpectedly."

Internet connection, VPN settings all checked by the local IT Team

Direct activation on Studio does not work either.

URGENT HELP NEEDED. THIS IS OUR third licence that we are trying to activate. Other two Licences are working fine. Please do not mess with them.