Thank you for your response. It helped me to find an alternative (3-rd) below.
The issue with using Firebase or any data base is that I will need to have a common key available in both AI2 and x-Thunkable, for AI2 to pass to x-Thunkable. For example the users telephone number would work if I could pass the telephone number to x-Thunkable. But that is not available in x-Thunkable.
I could use the time of day in milliseconds but I can’t find a function in x-Thunkable that will give that.
The 3-rd alternative is that I ask the user the common key (telephone number) and save it to local storage during setup in the first run in both AI2 and x-Thunkable.