Thank you all !!! You were a big help.

Trial and error...that's how people progress 

If I connect my 2fa wallet online, then I should receive the coins, since it corresponds to the address I sent it to.
And I don't need to restore the 2fa wallet the way the link describes it. Correct ?


From the link you sent, does this operation happens online or offline ?


Thanks

Yes, I have setup the wallet as 2fa....online. And since the creation it is offline. Reason is that I was not sure that the seed can be created offline... Can it ?




Is the reverse true: can I safely use a 2FA wallet online ? (this would be easier) or is it not that safe ?




What is the interest of using a watch_only version of a 2fa wallet, since the original wallet needs to be online anyway, due to the 2fa ?



Wouldn't it be easier if I create a new "standard" offline wallet, then send directly my coins to this new_offline_wallet using my current 2fa offline_wallet (that I would put online to send the coins and then delete right after the transaction) ?

It does return false


what is xpub ?

Thank you all for your help.

I checked the Master Public Keys of my offline_wallet - there are 3 keys - and I made sure that the one I used for my watch_only is the cosigner 1.

I deleted the watch_only wallet and re-created it with this cosigner 1 key... same issue, different addresses (the watch_only all start with 1, the offline all start with 3).
 
 There is an error window every time I open my offline wallet (seems to be a connection error - expected since I'm offline, could that be ?).
Also, I have setup my offline_wallet with a "2fa" as wallet type (and "p2sh" as script type). And I have setup my wacth_only wallet as "standard" with p2pkh" script type. Could that be the issue that the type of wallet differs (one being a 2fa and the other a standard) ?

When I try to re-create a watch_only wallet with 2fa, it asks for my seed. Since this watch_only is online, I am not sure I want to do this.
If I ask to generate a new seed, then it's a complete new wallet 

Lucius,

I did use the Master Public Key from my offline_wallet to create the watch_only wallet, but the "receive" addresses are different.
The watch_only wallet is connected and the transaction has 44 confirmations.

Hello,

I am a complete rookie in the Bitcoin world and would need a bit of help.
I have created an online Electrum Watch_Only wallet using the Master Key of my offline_wallet (running on Tails - offline).
I have bought some Bitcoins on Coinbase, and have sent them over to the offline_wallet (transaction still pending...for 20 min -  , it was a small amount to try it out).

I have then noticed that the receive_address on the watch_only wallet differs from the one of the offline_wallet.
- How will I be able to see the transaction to be received on my offline_wallet ?
- How is it even possible to send some coins to a watch_only (since I get the possibility to send the coins to the watch_only address) ?

Also, if I understand correctly I will have to transfer the coins from the watch_only to the offline_wallet to keep them safe and vice versa (to transact them further to other users or sell them). But how to make sure that it gets the coins transferred safely since I have to save some transaction files on a USB stick for example for every movement from one wallet to the other, while the USB stick will be connect to the online world at some point (when I load it to/from the watch_only) ? Is there no risk of virus ?


Thanks,
Nikky.