Alternate text not beeing picked up

I have put in the alternate text on the slide in the presentation and when I put presentation into the program does not identify that the chart has an alt tag

Hi Jim,

Please visit this documentation link for your kind reference. Please share, if I may help you further in this regard.

Many Thanks,

this is show i have defined the alttag


Hi Jim,


I am sorry that I have not been able to understand your query. Can you please share the issue if it is still existing on your end.

Many Thanks,