Data model loop: cant point 2 transaction dates to DateTable

On a high level, I have the requirement to show customers sales, and customer interaction (sales initiated activities) count, and whether customer interaction (activity count) is relate to driving revenue. 

My sales table has month end sales# per customer per month, my activity table has every single activity detail so I count the # of activity records to get the total count per customer - this table has activity date; and I have requirements to count MTD, QTD, and YTD. 

I have a DateTable. But my current data model wouldnt allow me to point both month end sales date, and activity date to the DateTable (it complains about having ambiguity bewteen account and DateTable). Without the linkage from both sides, when I pull both monthly sales and monthly event count in a single PBI table, the data is incorrect.

What would be a solution in this case?
Data Model

Thanks much!

NM