We strongly discourage removing Network Flow Analysis (NFA) as a data source unless absolutely necessary. However if needed, please be aware that in NetOps version 25.4.11, a known issue prevents you from re-adding NFA to the NetOps Portal once it has been removed.
NetOps Portal 25.4.11
NetOps NFA 25.4.11
This will be resolved for NetOps 25.4.12.