Hi guys , So I am setting up a automation that when a calendly call is cancelled by an invitee  , it looks up the latest available slots using calendly api and sends an email  to that person. However 1 issue that I have been encountering which is when I am passing dynamic values to the api it doesnot work ,but whenever I add static values the api returns me the available slots. 

Step 1- 4

• When an invitee cancels an event
• It first checks the event topic , if it matches certain topic name it works
• next in a google sheet it looks for that person
• updates that persons status to “Cancelled”

Step 5 and 6 

Here is where the problem begins 

In step 5 I have a code which retuns Get todays date and date on friday 

Then when I am passing these values to my Webhook 

This returns The app returned "The supplied parameters are invalid.".

But when I add static values

It actually works

Not sure what I am doing wrong even if i pass the dates as 2025-09-02 and 2025-09-07 it works on static but doesnot runs on dynamic values