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You likely put your invoice in the lightning address field rather than the invoice field. That's the only way that message would have appeared. Muun does not support LNURL or lightning address.
I just tested with both Strike and Muun and it succeeded.
SN does not support 0 amount invoices currently. When using Muun, you'll need to specify the amount when creating the invoice using "invoice settings."
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Yes this is exactly what happened, it's my mistake. I thought it would work the same as with BTC transactions.
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