
Hi,
As of now, the Expense mobile app in D365 Finance does not support Cash Advance Requests out of the box.
There hasn't been any official roadmap announcement from Microsoft about adding this functionality, but you can monitor the New and planned features for Dynamics 365 Finance, 2025 release wave 1 | Microsoft Learn or submit/vote for the idea on the Ideas List
For now, cash advance requests must be handled through the web client.
Warm Regards,
Zain