In a Power BI embedded (via azure workspace) I get the following error on some visuals:
"Custom visuals have been disabled for your organization"
The visuals are not custom visuals from the custom visual gallery but very simple standard visuals, for example a standard Card visual to display a string, referring to a measure with a simple IF statement to choose between two strings.
A common element to all the places where I see this bug is the use of IF statement in the measure that is displayed in the visual.
In all cases the visual is a simple Card.