Hi Michelle32,
Thank you for your response and for the information. I've granted you an access to our Private Message. When you tried to resend invitation to these users, may I know the error message so I can further check on this. Invite a user to an online file, has detailed information and instructions to assist you with this.
I have edited and removed your serial number and other sensitive information. Please do not add private information like serial number on public posts in the future and you can share these details when a moderator reaches out to you seeking additional information via Private Message.
Please let me know if you need further help.
Kind regards,
Sai