.tk is the Internet country code top-level domain (ccTLD) for Tokelau, a territory of New Zealand in the South Pacific.(Wikipedia)
Are you in New Zealand?? Why did you use Linode? And why did you not buy a domain on Namecheap? You can also use Replit. It has credits now, and you can use them to make an always on REPL I think 2 cycles a day, and you can buy 500 for $5.00 so… That adds up to $7.30 a year on that and 1.05 for a .xyz domain on Namecheap. Why not? Or is Linode Free??