SSTP blocked by firewall? [HELP]

I’m trying to use a VPN to bypass my school firewall. The only protocol is working is SSTP (Port 443) when I use a provider (MAXPING/GIAMPING).

I tried to set up my own VPN using SoftEther (SSTP Enabled) and it doesn’t seem to work in my school network (Connect just fine with cellular). Anyone knows what’s happening here?

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