Hello, the port requirements for intercluster communications must have the same MTU settings. You are moving from a 100MB/1GB (I'm guessing have a 1500 MTU) to 10GB, which may use the 9000 MTU setting. Are you able to test this across a 1GB link? I realise this is nothing to do with licensing, however as you've stated the licensing looks good.
Thanks,
Grant.