Reference Product Functionality Not Working

Hello,

The Reference Product functionality is not working. I have verified this issue in my setup, and it also appears to be non-functional in the sample plugin provided in your documentation.

Here is your documentation that I have used: https://www.tipsandtricks-hq.com/software-license-manager-plugin-for-wordpress

Please look into this issue and advise on a possible fix.

Thank you.