you can register at the German Embassy in London and get a change of residency status in your passport.
https://uk.diplo.de/uk-de/02/-pass/wohnortaenderung
It’s a bit annoying, but shouldn’t be a problem.
Edit: The Interrail Whatsapp customer service just confirmed that this is the only option for Uk residents.
Credit:stackoverflow.com‘
5 Mar, 2024
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