Hi xiaojia ,
Welcome to the Buttonizer community! 😄
Thanks for letting us know about this issue!
After further research, it seems like the WeChat chat URL scheme no longer works and now uses a QR code to share the account of users.
For now, we are currently prioritizing to release the next big UX update for Buttonizer, version 2.1.
We will update this function in the future after version 2.1 to make Buttonizer show the QR code after clicking on the button.
If you have any questions please let me know! 😀