Hi Balkar - I'm having the same problem as Jennifer. Keep getting an error message that the token is "unsupported token". The token I'm using in my flow is {{lead.Date of Birth}}. Any help you can provide would be greatly appreciated...thanks!
I know you asked this question a while ago and may have already gotten the answer, but the unsupported token error is because you cannot use a date token in the advanced wait step if the smart campaign does not have a trigger.
If anyone is still having trouble with the unsupported token error message, we found we had to change the token from {{lead.fieldname}} to {{leads.fieldname}} with an s. I hope this helps!
Thanks. The smart campaign also has to be a trigger campaign and not a batch campaign. I made that switch and didn't get the unsupported token message anymore.