The answer
Channel recovery can require specialized state or static-channel-backup procedures in addition to key material. The exact requirements differ among Lightning implementations and custodial models.
What to do next
Follow your wallet's official disaster-recovery instructions and test on a disposable channel before relying on any backup procedure.
Lightning Labs — Lightning wallet/node software
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Kraken crypto exchange
A crypto exchange to compare for supported assets and networks; not a repair for a failed transfer or permission issue.
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