You do not need to register your nuc.
Read : https://www.intel.com/content/www/us/en/support/articles/000006268/services.html
How do I use the Online Warranty and Support Tool?
How do I register my Intel® product?
How do I check if my Intel® product is still under warranty?
Here you will find help how to identify your Compute Stick: https://www.intel.com/content/www/us/en/support/articles/000005941/mini-pcs/intel-compute-sticks.htm...
But, he has a NUC.
Yes, I'm sorry. 😄 This is the link for NUC identification: https://www.intel.com/content/www/us/en/support/articles/000005804/mini-pcs.html
For more complete information about compiler optimizations, see our Optimization Notice.