Explanation
Moving a dashboard to a different collection doesn’t move the dashboard’s questions into that collection.
If the saved questions are stored in a restricted collection (such as someone’s personal folder), then other groups won’t be able to view those cards.
Someone with edit permissions (your Metabase admin is probably a safe bet) will need to move those questions into a collection that you have permissions to.
If you can’t solve your problem using the troubleshooting guides: