Row level security not displaying for user

Argh I cannot get row level security to work for a user. 

I followed the EdX video by Will Thompson and it isn't working. 

I added a security group on Desktop, added a single user (internal member of staff) to the group and re-published the dataset.

I then went to Power BI online, shared the report which is linked to the dataset with her, and shared the App with her.

She can open the App, but she does not see any of the visualisations. See below what she sees. 

What do I do??