Problem registering webhook. Error 32

[eric]

Hi there,
I’m trying to register a webhook at: https://api.twitter.com/1.1/account_activity/all/dev/webhooks.json?url=_[myurl]_
but I keep getting the same error 32.
{“errors”:[{“code”:32,“message”:“Could not authenticate you.”}]}

I was able to use the same authentication method to send direct messages (https://api.twitter.com/1.1/direct_messages/events/new.json)

I followed the instructions on getting started with webhooks, went through the trouble shooting page, re-generated my tokens, and recreated my environment, but still no luck.

I tried both using my own code and using postman but neither worked. (Both worked for sending direct message)

Please help, and please let me know what other information can I provide.

Thanks!