I am trying to retrieve all the organizations in my account but in the documentation an organization is always required in the API call.
https://dev.azure.co
A REST API request/response pair can be separated into five components:
The request URI, in the following form:
VERB https://{instance}[/{team-project}]/_apis[/{area}]/{resource}?api-version={version}
instance: The Azure DevOps Services organization or TFS server you're sending the request to.
They are structured as follows:
Azure DevOps Services: dev.azure.com/{organization}
The REST API's are organization specific. This is not documented at present. You could submit a feature request here: https://developercommunity.visualstudio.com/spaces/21/index.html
Our PM and product team will kindly review your suggestion. Sorry for any inconvenience.
As a workaround, you could use the API which captured from network traffic just as Matt mentioned.