Hi @Matteo Tavoletti ,
Welcome to Microsoft Q&A forum and thanks for your query.
Microsoft Stream is not a support product in Microsoft Q&A forum. For a list a Q&A supported products please refer here: Microsoft Q&A supported products
Microsoft stream has a dedicated community forum and actively answering user queries. I would encourage you to please reach out in that forum for immediate assistance: Microsoft Stream Community forum.
Hope this information helps.
Please do consider to click on "Accept Answer" and "Upvote" on the post that helps you, as it can be beneficial to other community members.