Need help adding articles from My Library to Group Library

Hello, I have 3 group libraries. I need to transfer articles from My Library to a Group Library. Zotero is letting me click and drag articles to 2 out of 3 of my group libraries, but there is one that is showing a red circle X when I try to click and drag. The Group Library owner did give me access, but on the browser version of Zotero I'm still seeing a lock symbol (I added picture of what this looks like). I am running the latest version of Zotero. Also, when I try to add the article via the browser extension, the shared library I'm trying to add to does not show up at all. What do you think is the problem?
https://s3.amazonaws.com/zotero.org/images/forums/u3756942/9lbb6nntk2mmgnymxve7.png
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