400 Bad Request error

https://va.tawk.to/v1/session/start

this is giving 400 bad request error. Can anyone help me out with this error.

I had same issue as i have enabled feature to disable few contry. I have disable blocking countries functionalty.

and it started working afterwords.

the blocking countries is disabled but I have the same issue !

It was due to a mistakenly disabling the Widget.
In your property Administration setting > Chat Widget, enabling this option mark your widget status active, and it starts working again.

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I’ve tested on my website, its working fine now.