Missing VPN plugin

Hello. I am trying to connect to sstp vpn network which is required to connect to my works computer. I have done this successfully with Ubuntu, Xubuntu and MX Linux before. Though when I set everything up and try to connect, I get an error that I am missing VPN plugin. I think that this is caused by the lack of some package but I am not sure. Would someone please help me?

I don’t know anything about it but I suppose you need sstp-client and network-manager-sstp.

Sounds like maybe missing these ?
networkmanager-openconnect & openconnect

oops. you did mention sstp. maybe @Tomek is right then.