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Am trying to get the private key for an imported address but am unable to do so.
I did tried to use the blockchain method but still unsucessful as I don't have the private key on the tab.
Only if you have inserted the private key, you will be able to export the private key again. So in your case, you never gave blockchain your private key. So you are unable to export it. Blockchain cannot magically create the private key.
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