Audio Recording is not working

Hi guys

I'm trying to implement the click-to-call with my CTI apps which use this guideline:
https://developer.zendesk.com/documentation/voice/sell-cti-developer-guide/adding-a-recording-or-notes-for-a-call/

The note is saved into system and when i tried to access ticket page, the recording file is not available eventhough my external link is ok and audio file is in .wav format as suggested.

The link is working well: https://demo8501.contactcenter-suite.com/rfs/gate?param=2e312e3032303230313036393564396d38313331323130322c3230302c306f3165352c33332c3037302e303031303231&audio=trueMany thanks.