Issue with Authorization Header for D-ID API Endpoint

Hello,

I'm using POSTMAN and trying to send a request to the following endpoint:
https://api.d-id.com/agents/agt_zD5N****/messages, but I'm encountering the following error message:

"message": "'*' not a valid key=value pair (missing equal-sign) in Authorization header: 'Basic *'."

I’ve correctly set up the API key for other endpoints like:

https://api.d-id.com/agents/me
https://api.d-id.com/clips/presenters
And they work without any issues. Could someone provide guidance on what might be going wrong when trying to use this particular endpoint?

Thank you!