Power BI only displaying Tasks/Activities that are up to 1 year old. There are no filters restricting this in Power BI. Anything in Salesforce to check? It's through out of the box Power BI Salesforce. 

I am able to see all our Account data from Power BI. I am posting this question for our data team in our org. We can't seem to figure out why we can't have all our tasks/Activities display on our Accounts it only displays Activities up to 1 year old.

I got stucked in PD2  Advanced apex specialist challenge2 - 
Update the codebase to use best practices.

I am getting below error while clcking check challenge. I have checked validation rules in my org but still same error. Thanks in advance.