When exporting a project from Clarity to Microsoft Project (MSP), the task is changing the ETC to 0 for a fixed work task with an assignment.
Checking further, the allocation for the resource is showing as 0% in the Resource column in MSP.
Release : All Supported Releases
Component : MICROSOFT PROJECT (MSP) Integration
This combination means that when the project is exported to MSP, it looks at the max % load value in Clarity, and not the team allocation value.
The below solution applies if you have 'MSP Assignment Units Mapping with PPM Assignment ‘Max % Load' checked. (See cause section for more details)