The seed is for onchain funds of you only. Not for the multisig wallet transactions established for channels. That's documented and the reason to backup
Discussion
from the funding wallet i have requested a closing of the channel and a refund of my money. the wallet shows the amount as refundable, shows the correct value, says channel shutting down and even asked to where. i was told it can take 14 days, it takes longer than a year now, nothing happened.
lightning is broken. i would not recommend it to anyone. only for very small micro payments where it does not matter
Do you have the closing transaction(s) or their id(s) ?