advanced screen sharing has explanation mark

ISSUE:  SHARE-ADVANCED-POWERPOINT.....  POWERPOINT has a ! in a triangle. Not working.  Was functional prior to a system update.

Today I having this same issue as well

Unable to share ppt as background. It is saying "You can share slides as background with presenter layout". 
I have enable the setting in my account setting. 

Yet I am unable to share the slide as background. 

Hello there,

I apologize for the inconvenience, but PPT backgrounds are no longer supported in Zoom versions 6.3.x and above due to a conflict in the software architecture. However, our engineers are actively working on bringing this feature back in the future. We will update you on this thread once we do have an update.

Thank you for your patience and understanding as we continue to improve your Zoom experience.