The format of the link you're sharing may determine how your pinned link appears in your room.
If your link has tracking information attached to it (usually a bunch of stuff following a ? after the main URL) this may break the link's ability to show the image. You can remove that part of the URL and your link will still take your audience where you want them to go! This should also fix your image.
If you’re still having issues, please reach out to the Community Support team and we can help you resolve the issue!