Hello @orders,
Welcome to the LastPass Community!
I will suggest to delete the user from the platform and send them a brand new invite. But before doing that, whitelist the LastPass domainsso you don't have any issue receiving the invite again. The domains and emails you will need to whitelist can be found here: https://support.lastpass.com/s/document-item?bundleId=lastpass&topicId=LastPass/allowlisting-firewall-configuration.html&_LANG=enus#:~:text=Email%20domains-,LastPass,-sends%20emails%20from
Kind Regards,
Alejandra
LastPass Support