Screen share > advanced > Powerpoint as a background

Hello everyone,

Since it appeared as a Beta-option, I have been a keen user of the "Screen share > advanced > Powerpoint as a background" feature, which has always worked well so far.

However, when I tried again yesterday, the clickable area with the text "Powerpoint as a background" on the "Advanced" tab  was not clickable anymore, and it showed a warning symbol with an exclamation mark. The other 5 options on the "Advanced" tab seem to work just fine.

I tried this on my desktop, as well as on my laptop, and with the same result: no access to the "Powerpoint as a background option" anymore.

Anyone has an idea what the cause of this is, and how it can be solved?

Many thanks in advance for your suggestions.