All the accounts associated with the management workload domain are disconnected.
VDT shows:
[FAIL] Edge Transport Nodes for #######
##### does not exist in SDDC Manager DB.
##### does not exist in SDDC Manager DB.
##### does not exist in SDDC Manager DB.
##### does not exist in SDDC Manager DB.
##### does not exist in SDDC Manager DB.
##### does not exist in SDDC Manager DB.
SDDC Manager 5.x
VDT output seems to indicate a mismatch between SDDC Manager reference to these accounts and NSX-T.
However, NSX-T Edge node window shows that the names exactly match.
This issue occurs because SDDC did not trust the signing cert for the MGMT ESXi hosts. (VMCA).
See:
https://knowledge.broadcom.com/external/article/316007/
To resolve it, update SDDC manager with the current certificate in vCenter as indicated in the KB article above.