UK 26-30 Railcard online purchase form broken

the online form to buy a new 26-30 railcard in the UK seems to have a bug that bars me from buying it online (phone queues are impossible to get through, also can't be bought in a ticket office).
I need to validate my passport/ID card (presumably to verify my age) typing in a long identifying document code, including a 3 character country ID ("e.g. GBR", the website suggests, unhelpfully, in my case). I have a German passport, so the country ID is "D", encoded in the document code as "D<<". But the form doesn't accept this. It says: "The country ID must comprise 3 characters". The FAQs even say to ensure copying the chevrons in case of codes shorter than the required characters. I think the form just doesn't recognise "<" as a regular character. Which is so poor!
Has anyone encountered this issue and got around it? As I say, this rail card cannot be bought at an office by its own website's admission, and the phone queues are impossible to get through. And I need it very soon to be eligible.
Many thanks for any suggestions!
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Can I get an online version of my Railcard?
Unfortunately you can only have one version of your Railcard \u2013 either plastic or digital. Once you have purchased your Railcard you cannot change the type of Railcard you have.How do I get a new download code for my Railcard?
Follow the link to 'My Railcard', and scroll down to the Railcard you would like to generate a download code for - selecting the 'Details' button. Finally, select 'Request a new token for your Railcard'. This will generate a new download code, which you will need to enter in the Railcard app.What happens if you get caught without your Railcard?
If you forget your Railcard you will either be required to buy a new ticket or you may on certain services be liable for a Penalty Fare. However, a train company will normally allow you to claim back this extra expense on the first occasion in each year where this happens.Buying 26-30 Railcard at 30 years old
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