Function Calling fails just on Android ( Samsung )

I have my GPT with my custom action. It is performing HTTPS call to my lambda action ( AWS generated URL ).

Result is a long text and sometimes a ling to a generated graph.

It works on Web and iOS apps. While trying to run it on Android ChatGPT mobile app ( Samsung ) I only have information:

“The tool I was using to… is currently unaviable”

How to solve the problem? How even to debug?