Repro steps:
1. I created a Dynamics 365 Sales trial with Region as /US/.
2. Turned on Copilot in PP admin center.
3. Turned on Auditing.
4. Opened Sales Hub App > App Settings Area > Under General Settings > SALES COPILOT sub area NOT VISIBLE.
As per MS docs, we can enable D365 Sales copilot as per above 4th step.
When I created trial last month, I was able to see this option.