@Julien - 

From reading the Miro Airtable app and Help Center article documentation, the app allows you to embed Miro boards into Airtable bases and not the other way around - as per the Airtable Help Center article:

If you wish to embed an Airtable object a Miro board, I would suggest that you refer to the following Airtable Support article:

https://support.airtable.com/hc/en-us/articles/217846478-Embedding-a-view-or-base

Once you have the embed/<iframe> code from the Airtable site, you can follow these instructions to embed the Airtable into your Miro board:

https://help.miro.com/hc/en-us/articles/360017730993-Embedding-media-to-boards