authorizeLocalSharingDevice throws AccountNotFound

[zeroCat]

Hello,
I am getting a 

UnhandledPromiseRejectionWarning: Error: AccountNotFound

when trying to Authorize the local SentryFile to get a deviceToken.
My code is currently as barebones as it could be.
 

const SteamUser = require("steam-user");
var c = new SteamUser();

c.logOn({
    "accountName": "...",
    "password": "..."
})

c.on("loggedOn", (det)=>{
    c.setPersona(SteamUser.EPersonaState.Online);
	c.authorizeLocalSharingDevice("Test-PC").then(res=>{
        console.log("token: "+res.deviceToken)
	})
})

The Online Status successfully updates, however i get a promise Failiure on the authorizeLocalSharingDevice.
What am i doing wrong?
~ ty

[Dr. McKay]

Do you have Steam Guard enabled? If you do, then I really don't know what the issue could be. Family Sharing support is experimental and I've not done too much testing with it.

[zeroCat]

Ah, i was not aware that steam guard must be enabled to activate Family Sharing.
I enabled Email Guard, and it works fine now.
I did not think about this because the AccountNotFound code was throwing me off.
Thanks for the Answer! ~solved