I've been playing around with the Prospect to Cash templates from Finance and Operations integration with Dynamics For Sales. When using the Products template (pushing from Ops to Sales) I am getting this error:
([Request timed out. inner exception: A task was canceled.], The remote server returned an error: (504) Gateway Timeout.), AX export encountered an error
The export job in Finance and Ops shows no history, and no error messages.
Please consider take a try to remove the connection to your D365 For Sales and D365 Finance and Operations connector from your PowerApps, and then re-add a new conection to them within your PowerApps, then try your Data Integration again to check if the issue is solved.
In addition, please also take a try to clear cache of your browser, and then try it again to check if the issue still exists.
Also please make sure your Network bandwidth is in a good state.
The user @FellixHillmer has faced same issue with you, please check the following thread: