IPFS swarm key for BUILDING A PRIVATE IPFS NETWORK WITH CLUSTER

Hello, I found that the ipfs swarm key no longer works. also, I could not find an updated one.
I want to build a private ipfs network with ipfs cluster.
What can be done currently to build the private network between nodes?

Did you find any solution?

No, haven’t found any yet

Where did you see that swarm keys no longer works ? It seems to work fine on our 0.18 IPFS network