@rmn87 Hi, I have been following a path similar to yours.
(Use of nmcli from inside a snap)
I am trying to use nmcli from inside my snap (which basically is a java application).
I have successfully the nmcli binary into my snap and also made the network-manager connection.
I am still getting an error returned from nmcli con show from inside the snap. The guys on the forum have confirmed that I have no security issues so it should be all fine.
Did you also run nmcli as root as someone suggested or can you recall anything else that had to be fixed?
Thanks.