What does Ezra 2:63 mean?

The governor told them not to eat any of the sacred food until a priest could decide the matter using the Urim and Thummim. Ezra 2:63 - Modern Text Bible

(The governor (probably Zerubbabel) said they couldn’t share in the priestly privileges until a priest could use the traditional method (Urim and Thummim) to decide their status.)