Hello @fernando.guerra,
My name is Henry Eduardo and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
I am sorry about the issues you are having with the shared items. Can you please both you and the sharer follow the steps from this article, and verify if the issue is resolved? You may need to have the passwords shared again for them to work.
Please let me know if this worked or if further assistance is required.
Thank you,
Henry Eduardo | Customer Care