After running the NSX upgrade pre-check, warnings occur indicating issues with the edge nodes. However, when looking at the edge nodes under "System", "Fabric", "Nodes" in NSX manager UI, the edge nodes are showed as "UP" and healthy.
Upon checking the error details, you might see similar message as:
VMware NSX-T
VMware NSX
NSX upgrade precheck will flag any open alarms for the NSX transport nodes as errors even when the nodes are working as expected which is by design
Identify any open alarms for the transport nodes by going to the NSX manager UI and check under "Alarms".
Resolve any open alarms for the NSX transport nodes before proceeding with NSX upgrade.
After resolving all open alarms, precheck should pass.