I topped up electricity on to my old key by accident, can I transfer this credit onto my new one?

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I accidentally topped up £30 on to an old prepay key, and the credit would not get transferred from that key to the meter, I get an error message. I want to now whether this credit can be transferred from the old key to the new one?

I topped up electricity on to my old key by accident, can I transfer this credit onto my new one?