Creating a filter table to avoid having two onscreen filters - Ambiguous relationship

Hi there,

In my current report I'm looking to filter 2 tables using one onscreen filter by introducing a helper table (user account details, and required training) by the same column type (team). The issue I'm getting stuck at is Power BI won't allow an active relationship due to an ambiguous relationship between the Team Filter and Training records. Maybe there is a better way to achieve this, or maybe I've incorrect setup my data model. 

I'm sure there's something I'm doing wrong, any help would be greatly appreciated, thanks in advance!

Training Records - Fact Table

User account details - Dimension Table

Required Training - Dimension table

Team filter - Helper

Sample Data:

User account details:

Training Records 

Team Filter

Required Training

Kind regards,

Zak