Snap behind a proxy

My distro is Manjaro XFCE and I am behind a company proxy with authentication.
I set-up snap following the guide in the install page for Manjaro [0]
For a series of reasons I set-up proxy configuration per-app or in case of consoles locally to a terminal via setting environment variables http_proxy etc. For bad / non-available proxy support I use proxychains [1].

Even when setting up correctly http_proxy, https_proxy variables in a terminal and then running e.g.

snap install skype

I get an error:

error: cannot install "skype": Get proxyconnect tcp: dial tcp :0: getsockopt: connection refused

Tried with proxychains to no avail…

Any ideas or workarounds?