Hi @Janet-PA 
Thanks for posting your question! Here’s a couple support article that may help with this:

Intuit Link in ProConnect Tax - scroll to "Update client email"

How to invite a clients to Intuit Link using ProConnect Tax - scroll to "I sent an invitation, but my client never received it. Why?"

If you need further assistance with this we would reach out to ProConnect Support, as they can best help with your specific situation.

Looking forward to seeing more of your contributions in the Community!