VMware NSX-T Datacenter
The Failed logical ports are false positives , you can see that the logical ports and corresponding segment ports are already present in the NSX UI's global search.
This is a known Bug in 3.X.
These are false positives and can be ignored while doing M2P in NSX 3.X
Fixed in NSX 4.X.
Post upgrading the NSX 4.X we will not be seeing the false positive objects in M2P promotion.