Athom will check your provided details. Just wait.
The only other way to get in direct contact would be via Slack/developer channel.
Btw… Is the API access only for your private use? Then better use the HP23 API token.
If it’s for public access, then Athom will check your use case in detail and give you some scopes (most read only). You have to check the scopes and perhaps go into discussion via Slack (PM) to justify your needs