Test Board is missing in the JIRA agile board.
Correct filter has not updated to the board.
Please check the board if it has any shares or filter associated to it. If there is any filter present click on the Edit Filter Query link as shown in the below screenshot. Check if the project (to which the board belongs) is existing / deleted ?
Title : Test Board is missing in the JIRA agile board
Product : Zephyr for JIRA Cloud