The force close action was initiated by your LN channel peer not by KuCoin. So you have to deal the funds recovery with your peer not with KuCoin. The timeout could be due to payment path failure or not so reliable communication, it encounter a bad forwarder and HTLC expired That's why your channel peer force closed that channel. Kucoin have nothing to do with this, they are just the recipients of the payment that never arrived.
You mention that you used Electrum with a LN channel. I supposed that you were connected to a Electrum server through Tor. THAT could be your problem - Tor is really unreliable for LN payments. Is only adding huge response time and that could trigger force closures, due that your node is not responding well in the graph, so the peers will consider you as a dead node and automatically initiate the force close.
I will suggest to run locally an electrum server and connect to it by LAN IP or use a trusted electrum server on clearnet.
The force close action was initiated by your LN channel peer not by KuCoin.
So you have to deal the funds recovery with your peer not with KuCoin.
The timeout could be due to payment path failure or not so reliable communication, it encounter a bad forwarder and HTLC expired That's why your channel peer force closed that channel.
Kucoin have nothing to do with this, they are just the recipients of the payment that never arrived.
You mention that you used Electrum with a LN channel. I supposed that you were connected to a Electrum server through Tor. THAT could be your problem - Tor is really unreliable for LN payments. Is only adding huge response time and that could trigger force closures, due that your node is not responding well in the graph, so the peers will consider you as a dead node and automatically initiate the force close.
I will suggest to run locally an electrum server and connect to it by LAN IP or use a trusted electrum server on clearnet.