Hi André Denis,
If you have lost track of the subscription associated with your Azure Vision service but still have the service URL, there are a few ways to recover the information.
First, check the Azure Billing Portal (Cost Management + Billing) to see if any of your accounts are being billed for the service, as this might help identify the correct subscription. You can also use the Azure CLI by running az login
followed by az account list --output table
to display all subscriptions you have access to.
I hope this information helps.