I have been trying unsuccessfully to sign up to Instant Ink for the past two weeks. After i've filled in payment boxes and name and address fields, the system jams up telling me I have an 'invalid address'! I've rung HP a few times but they sound quite vague as to what the problem is but assure me they are working on it! In the meantime, i'm printing away and wondering when I will run out of ink!
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