Error during Step 3: This typically occurs because the LAS supports Subscription entitlements only. Perpetual licenses are not supported in this environment.

Error during Step 2: The activation request file was likely generated from the wrong source. You must generate the file on the license owner. For example: In an SDX deployment, generate the request on the SVM, not the VPX.

For step 3 error: Citrix Operations team is actively converting all perpetual licenses to the subscription model in the licensing systems. Please refer to this article for the ETA: NetScaler Perpetual License Migration Guide. Please re-activate LAS after the ETA. 

For step 2 error: Regenerate the activation request file on the correct endpoint (the license owner).

If above actions cannot help you, please reach out to Citrix Support. 

This article describes a typical issue during LAS transition: No supported entitlements are available for activation