What major hurdle must be overcome regarding tritium supply for long-term fusion power?

Answer

It is naturally very rare and radioactive with a half-life over 12 years.

Tritium is challenging because it is naturally scarce and possesses a relatively short half-life of just over 12 years, necessitating in-situ breeding for sustainability.

What major hurdle must be overcome regarding tritium supply for long-term fusion power?
powerlimitFusionnuclearchallenge