Elfsight Iframe embed code ADOBE PORTFOLIO

Did someone ever tried to deal with the Iframe builder Elfsight in Adobe Portfolio ?

Here is the Iframe code :

<iframe src='https://sandbox.elfsightcdn.com/4274fea5-917f-4828-aa9a-3897cc1fe7b7' width='100%' height='1000' frameborder='0'></iframe>

It is approved by Elfsight itself.

This code is not working and I don't understand why.

Do someone encountered a similar issue ?

Thanks in advance