How to Claim BTG from Electrum(not standard)Coinomi by seed/privatekey-not work(

I am using Electrum on OSX . When I created electrum wallet I was chosing not standard wallet. It is called 2of3 wallet .
( at the top of the Electrum window I can see the following “ Electrum 3.0.2 - default_wallet [2of3]”)

I have tried to claim BTG from my electrum “[2of3]” wallet to Coinomi.

First of all by private keys as this video shows: https://www.youtube.com/watch?v=0bDi6vjmQ7U
Using the sweep function just tells me there aren’t any funds in the wallet which i know are there as i can see them on the BTG block exporter using the address.

Second way as some one suggested: https://99bitcoins.com/how-to-claim-bitcoin-gold-btg-guide/
But when i use the seed for restoring the wallet is says the seed is incorrect and to check the spelling.

I have tried scanning and manually entering the seed/private key but i run into same problems.

There is one more characteristic feature I noticed you can easily distinguish working wallets from problematic. If the wallet number starts with number "1", the claim will be successful. If it starts with number "3" the claim will not work.

My wallet starts with number "3", can someone help me please?