Cannot Get Google's Try This Api To Work For Freebusy

I asked this question a couple days ago, and I appreciate (and accepted) the answer. Unfortunately, like most issues, it just let to another question. My Question why can't I get

Solution 1:

Solution

The ID you are using is not your actual calendar id, that is why it is not working.

Follow these steps to find your calendar ID:

1. go to your Calendar.
2. Navigate to your subscribed/available Google calendars list.
3. On the right of these you will find three vertical dots (see image), click those and select Settings and sharing.

4. Go to the bottom of the new page that will open and under Integrate Calendar copy the value of the first item that will be Calendar ID.

Then just replace the ID you have for the actual one.

I hope this has helped you. Let me know if you need anything else or if you did not understood something. :)