I have a problem with the U2F message. I use a Chrome browser, but I can not unlock my wallet at www.myetherwallet.com. I do exactly the same steps as the clip that is for tokens migration, but I go to unlocking the wallet. I apply picture as proof.
Below I’m sending you a transaction proving the availability of my AE tokens in Ledger Wallet. Please report their availability and give me instructions on how to transfer them to your new blockchain / migration /.
So, we can not specifically debug this issue, as it has to do with:
Ledger Wallet
MyEtherWallet
U2F protocol on your browser.
I would suggest to try with a different chrome version or different browser that supports U2F.
For the U2F protocol to work, you need to have:
HTTPS connection
Your Ledger wallet connected to your computer.
Which I assume you’ve already done.
Regarding:
Is it likely to lose them for some reason?
No, as long as you didn’t send them anywhere which you do not have access too, then everything is fine. (When I say access, I mean You have generated the aeternity address [which starts with ak_] and you have the phrases / private key stored somewhere safely)