Hi @AnthonyLatini @Anonymous User,
I have published GIS layer on ArcGIS Organization account. I tried to join the Power BI data attribute to GIS online layer in Power BI. However, the Join Feature is not showing here:

The Join Layer in Power BI is also added in Fileds and this column also available in GIS layer

The same type\info in ArcGIS Online layer

The GIS layer is added\uploaded in Map Viewer in ArcGIS Online account.
Thanks,
Reza