Give the form linked below to your employer. A week later go to NHI office near you and apply for a new card.
https://tw.forumosa.com/t/new-format-for-arc-aprc-number-is-not-accepted-testing-and-reporting-thread/200014/436
https://tw.forumosa.com/t/new-format-for-arc-aprc-number-is-not-accepted-testing-and-reporting-thread/200014/447