Thanks, that does seem to be very similar to the issue I'm also having - hopefully there's something wrong with their system temporarily then. Will have a look!
Looks like the transaction is already been confirm and according to the address almost 1 btc plus is in this
https://blockchain.info/address/12koSJgNGSVWbPfN8G4ZViy3iKpGxPJ1hLIt means its should be inside of your ledger nano you can also export the private keys and import it in electrum. .
Just to see if your bitcoin is there this is much easier
Backup the private keys of this 12koSJgNGSVWbPfN8G4ZViy3iKpGxPJ1hL
And much better to contact the support you can use the contact email from this site
https://www.ledgerwallet.com/contact