I am attempting to add an email to the above workflow, but it is only allowing me to add names of other Calendly users. My understanding is that I can use any email address in the To: line.
Outlook has been integrated and it works for another workflow not this one.
HI
Yes you should be able to add any emails to the ‘TO:’ line, however, If you’re adding an email that's not in your organization, you’ll need to hit ENTER to add it:
Let me know if this works! If you’re getting a different error, let me know! I can look further from there.
Thanks for quick response and I can’t believe that fixed the problem. (Dah).
No worries at all! Glad its working now. 
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