Hello @j.morgankuberry,
Welcome to the LastPass Community.
I hope this message finds you well. I hava seen that message mostly when the user's does not ahve a sharing key generated. I recommend you to install the LastPass ext and login from there, directly. This in order for you to generate a sharing key that will help you to use the sharing without any problem. You can check more here: https://support.lastpass.com/s/document-item?language=en_US&bundleId=lastpass&topicId=LastPass/FAQ_Sharing_Key_Error.html&_LANG=enus
Kind Regards,
Alejandra
LastPass Tech Support