ArcGIS Pro failed to connect to specific license manager
We are trying to run ArcGIS Pro 2.5 with concurrent use licenses (manager 2019.2) on laptops with direct access. We applied the environmental variables (e.g. Variable Name: FLEXLM_TIMEOUT Variable Value: 10000000 and Variable Name: FNP_IP_PRIORITY Variable Value: 6) to all laptops but a dozen or so still won't connect. We had Esri tech support set up the ports correctly with license manager and they think it could be anti-virus blocking ports but we are all running the same anti-virus and some computers work. We re imaged one of the offending laptop to the same system settings the users of the laptops that work correctly and it still is not working.
UPDATE: While writing this we stumbled on the solution but it took almost two weeks of working on this full time and trying to find alternative solutions. Hopefully Esri can fix this error and associate this fix with ArcGIS Pro so it's easier to find.
FIX: Error: The computer you chose is not a valid license server
