ReportingWssSyncListFailed error after modifying a Project site template list – Office 365 Project Online

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Reporting Wss list sync failed:
After customize the Risks and Issues list under Project Site in Project Online, we receive ReportingWssSyncListFailed error while creating new project.

Reporting Wss list sync failed:
ReportingWssSyncListFailed (24018) - Failed to prepare the transfer of SP list 100 for project 'b7d502b3-228f-e811-80e7-00155d34dd12'. The field AssignedTo was missing from the SP list and was ignored.. Details: id='24018' 
name='ReportingWssSyncListFailed' 
uid='b9472b26-238f-e811-80e7-00155d34dd12' 
ProjectUID='b7d502b3-228f-e811-80e7-00155d34dd12' 
SPListType='1100' 
Error='Failed to prepare the transfer of SP list 100 for project 'b7d502b3-228f-e811-80e7-00155d34dd12'. The field AssignedTo was missing from the SP list and was ignored.' 

Reason:

Project Online was trying to import data from a Project site into the Reporting Database. Unfortunately, when it gets to List 1100, it didn’t find the “Assigned To” field, so it ignores it and raise error.

SP List ID SP List Name
1100 Issues
1101 Risks

Solution:

Solution 1: Don’t remove any of the default columns from Risks and Issues list.

Solution 2: If you already removed the default column and getting this error.

Step 1: Remove both Issues and Risks list

Step 2: Deactivate “Project Web App Connectivity” feature.

Step 3: Activate “Project Web App Connectivity feature” feature it will create risks and Issues List.

Step 4: Assign the custom content type for this lists – Risks and Issues. (Don’t remove any of the default column.)

Step 5: Make the custom content type is default for both risks and Issues lists.

Conclusion

Don’t delete any of the default fields in these lists Risks and Issues, Best to create content type and assign the content type for this lists or  rename the default columns as per your requirement.