Hi @GIMENES Magalie ,
As mentioned by Wade Zhou in your previous post, your organization is not backed to Azure Active Directory, so if your account is not a Microsoft account, you cannot login. He is correct that the DevOps owner would need to connect the organization back to Azure Active Directory, add your email, and then you can login.
I also understand that you are receiving the message, "You can’t sign up here with a work or school email address." You cannot add your work account when you are adding a Microsoft account or creating a new one. So if the devops organization cannot be backed to an Azure Active Directory and add your account, you need to use a personal account (gmail.com, yahoo.com) to login.
If you are simply having trouble logging into any services with that account, however, you can reach out to free billing support for help with your access issues. https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide&tabs=online
https://azure.microsoft.com/en-us/support/
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