A callUUID is required to check which XML is executed during your call. You can find the call_UUID in below ways:
There are two ways by which you can find the UUID for a particular call
By checking your account dashboard logs:
Login to your Plivo dashboard from here https://manage.plivo.com/dashboard/.
Click on Logs.
Click on the timestamp of the relevant call which you want to debug.
A new window will pop up with the UUID
Using the get all call details API: https://www.plivo.com/docs/api/call/#get-all-call-details
To find the call_UUID for a certain call you can use this API by making a GET HTTP request to the call detail records(CDRs) which will result with information about calls along with details about each call.
After getting the callUUID, navigate to https://manage.plivo.com/logs/debug/?type=all and input the call_UUID in the search field, you will get the details of the call like this
You can check the XML document which is used on the call to handle the call flow which will help you debug the call from your end as well.