Your flow json is corrupt due to no following forum guidelines on posting code.
In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)
```
code goes here
```
You can edit and correct your post by clicking the pencil 
icon.
See this post for more details - How to share code or flow json
Saying that you are using a inline keyboard, so you should receive the call back using a event node set to callback not a receiver node, Check the node examples in
ctrli i > examples > telegrambot.
