How to join three tables with relationship using DAX only

I need a help here. I have 3 datasets in power BI having relationships. Now, I have to use these power BI datasets in Power BI Report Builder. I need to join these three tables using DAX only in Power BI Report Builder. I am trying the below code but the code only works with two tables. How to join the 3rd table?

DAX query that does not work -

EVALUATE NATURALLEFTOUTERJOIN(
 'PortalUser_SiteInformation',
 'OverviewTrainingCompleted',
 'CourseDetails'
 )

The above code works if I remove 1 table from the above query.

Below is the screenshot of relationship between these tables:-

All 3 tables have relationship with column User_id. Below is the screenshot of Power BI Report Builder

I Know how to join tables in PowerQuery but I have only option to join in Power BI Report Builder. Please help me to join these three tables in DAX.

Thanks in Advance..

You need to check the requirements for the join conditions in DAX for NATURALLEFTOUTERJOIN():

It seems that Your Middle Table(PortalUser_Siteinformation) has a different column name than the other 2.

I recommend you to check full requirements(column names, data types, lineage etc.. ) of your tables involved.

And after fixing that, You can try this DAX Code:

EVALUATE
NATURALLEFTOUTERJOIN (
    NATURALLEFTOUTERJOIN (
        'PortalUser_SiteInformation',
        'OverviewTrainingCompleted'
    ),
    'CourseDetails'
)