[Detailed description of the issue or question]
I want to register a webex webhook contact point in the grafana UI, but 400 Bad Request is popping up.
Only webhook url and Bearer Token are provided by webex, what additional information should I enter?
[Step-by-step instructions on how to reproduce the issue, including any specific settings or configurations]
[Insert the version number of the software]
[If applicable, include any relevant log files or error messages]
[What the user expected to see or happen before the issue occurred]
[What actually happened when the user encountered the issue]
[Include any additional information that could be helpful to diagnose the issue, such as browser or device information]