Adding links to email reminders before a meeting

[ABJ]

I need to link a form for my clients to fill out for their upcoming meetings that they have scheduled with me . They need to fill it out ahead of time so I am trying to embed the link within the reminder email that they receive the day before the meeting. I can get as far as copying and pasting the link when I click on the "embed link" option but then nothing happens after that, even when I press "finish". I am attempting to embed a link using a form from the app Tally Forms. 

Can someone help me with this please?