Expense Mobile App Error – "Connecting to Server Failed"

Summary:
Unable to submit expense reports through the Oracle Fusion Expenses mobile application. The application displays the error message "Connecting to server failed" during submission.

Content (please ensure you mask any confidential information):
Users are able to log in to the Oracle Fusion Expenses mobile app successfully and create expense reports. However, when attempting to submit an expense report, the application returns the error:

"Connecting to server failed"

The issue appears to be specific to the submission action. Internet connectivity has been verified, and the behavior is reproducible. We would appreciate any guidance on potential causes, troubleshooting steps, or logs that should be reviewed.