Permission denied when checking mounts

Hello everyone!
I’m trying to make a call to the “/v1/sys/mounts” endpoint with the admin token I got from the vault (the token has root permission, I’ve checked it in lookup-self, it has the hcp_root policy). However I keep getting the same error: “1 error occurred:\n\t* permission denied\n\n”.
I’ve made sure that the header is not misspelled by the way.
Anyone has any idea of what is happening?

Thanks in advance!

Did you pass the Namespace as part of the request?

This article may be helpful - https://support.hashicorp.com/hc/en-us/articles/4404513576851-Permission-denied-using-Vault-CLI-with-HCP-Vault

Other options on how to pass namespace can be found here.