Michael Yoshpe

> Hi [@MichaelYoshpe](https://github.com/MichaelYoshpe) thanks for writing in 💯 > > I'm trying to reproduce this on my end, just to make sure I understand correctly your app listens for message...

> [@MichaelYoshpe](https://github.com/MichaelYoshpe) I've tried to reproduce this behavior using variety of user tokens in the `chat.postMessage` request and I haven't been able to trigger the error you are experiencing 🤔...

@WilliamBergamin thanks for the testing! I added the same code on my side and triggered some events, same result - while the body of the event seems to be correct...

@WilliamBergamin the fact it is working for some events and in others it doesn't, makes me think it is not related to other components in my backend. I tried to...

@WilliamBergamin after some more debugging, I think there is still a difference between the above reproduction and my use case - I am using a multi workspace app, while the...

We further debugged the issue and found the root cause to be on our side - our API Gateway altered the events which resulted in the signature mismatch.