ERROR: API function failed (50030,71521,19886)

Title

Symptoms:

We may notice a discrepancy between Flexnet Publisher versions where the “FLEXnet” trusted storage directory found at C:\Program Data\ is not being created by FNP API’s/calls anymore post-release 11.18.2.0 and getting the error ERROR: API function failed (50030,71521,19886) after manually deleted the folder FLEXnet. Is this expected behaviour or how to fix it?.

Diagnosis:

The following steps should create the FLEXnet folder before FNP 11.18.2.0 however post this it is not.

Install/configure a product enabled by FNP Trusted license models and then Delete the “FLEXnet” directory (If already created) located at C:\Program Data.
Depending on the products enabled as either node-locked uncounted, or floating borrowable license models, run any or all of the following calls: flxActCommonLicSpcPopulateAllFromTS, lc_vsend, flxActCommonHandleGetUniqueMachineNumber.
“FLEXnet” trusted storage folder should be created at C:\Program Data\
The lack of the FLEXnet directory causes the application to be inoperable for activation.

Solution:

It is an expected FNP behaviour after the fix of FNP-24746 in FNP 11.18.2 (Windows vulnerability issue w.r.t symbolic link).

As a part of the solution of FNP-24746 (Windows vulnerability issue w.r.t symbolic link), the Install anchor service takes the responsibility of creating the FLEXnet folder under "C:\ProgramData".

Post execution of Install anchor service, in case the FLEXnet folder gets deleted (which is unexpected), then the FNP application is expected to return 19886 system error which is "ERROR: API function failed (50030,71521,19886)"
When the system error 19886 occurs, make sure folder C:\ProgramData\FLEXnet exists otherwise execute the Install anchor service to create the folder C:\ProgramData\FLEXnet.
Find more details in "FlexNet Publisher 2021 R3 (11.18.2) C/C++ Function Reference" guide page#310 as below:

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Case id: 00001065