Relationships not working

I have Table A with 1 record

RowKey

109899918181

Then Table B contains 2 records

ID

109899918181, Description A

109899918181, Description B

In relationships i Power BI Desktop I connect up these two tables One To Many RowKey to ID

Then I create a table and drag it an item from both tables and they are clearly not connected. 

Does anyone else have a problem with this? Am I doing something wrong? Any help would be appreciated

Debbie