ADs txt is not updated

Dear Support, 

First of all, I didn't place the Ads.txt manually. It was done following the plugin only. That time it was not working, we reported, you guys fixed that issue, and we successfully added/updated the ads.txt file. But now again, as it is required to update, eventually it is failing. 

I have followed the steps according to the guidelines, but till now, the message is appearing, as shown in the screenshot. I used the button “Enable Ads Script”, which shows successful updation. But till now, the warning message is not gone.