Hello!
I see that you are having a problem with the invitation not being received by the invitee. Here are some troubleshooting steps to take:
Step 1
The invitee should check their Junk/Spam Email folder. Sometimes, the invitation email goes in to the invitee’s Junk/Spam Email folder depending on their email server security setups.
Step 2
You can also try resending the invitation email: Resending a Guest Invitation
Once they locate the email, the invitee can access the workspace by clicking the blue button labeled “Access the workspace now” in the email.