You might have the problem that when you are opening dev.azure.com you will be redirected to portal.azure.com. Likely you were not looking for portal.azure.com but rather for Azure DevOps. This is how you can find your Azure DevOps organization and gain access back.
Since you are already in the Azure portal, you can use the search directly and look for “Azure DevOps Organizations”.
Once you are here, you will find a link that brings you to an overview of Azure DevOps Organizations to which you have access.
The link specifically is this: https://aex.dev.azure.com/me You can also open it directly from here and see your Azure DevOps organizations
