Muun is not a lightning wallet. Did you show him how to do the recovery? You know he will pay unnecessary high fees with muun? Kudos for the pilling, but you might use a real LN app next time
Muun can create and accept Lightning invoices and it is non-custodial and no-kyc which is also wonderful. What is making you say it's not a lightning wallet?
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Not verified myself, but my experience with Muun tells me similar things
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