Display meta box data within sidebar.php

I’m able to display data from meta box within front-page.php with no issue at all (specifically using post meta box). It returns an array of page IDs as expected. However, if I use that same exact code in sidebar.php it returns a single, empty string. I figured I’d reach out here to see if anybody has experienced anything similar.

Thanks.

https://ww.wp.xz.cn/plugins/meta-box/