The issue below has been confirmed.
We are currently investigating the issue and working to address it.

【Confirmed Issue】

“Resplendent crafter's tools” that have not been obtained can be purchased by the Calamity Salvager and Journeyman salvager NPC.

*As a temporary measure, with the Several Areas Emergency Maintenance on All Worlds (Apr. 20) performed on April 20, 2021 12:00 a.m. (PDT)/ 7:00 (GMT)/ 8:00 (BST), players will not be able to select Purchase Quest Rewards → Purchase Achievement Rewards III from the corresponding NPC. We are planning to implement a Hotfix in the near future.

We apologize for any inconvenience this may be causing and thank you for your understanding.

*Edited on Apr. 27, 2021 at 2:00 a.m. (PDT) /09:00 (GMT)/ 10:00. (BST)
The issue above was addressed in the maintenance that took place on Apr. 26, 2021 from 10:00 p.m. to Apr. 27, 2021 2:00 a.m. (PDT).
The issue above was addressed in the maintenance that took place on Apr. 27, 2021 from 5:00 to 9:00 (GMT)/ Apr. 27, 2021 6:00 to 10:00 (BST).
We sincerely apologize for any inconvenience this may have caused.