Hello @Aus Lacroix,Based on your description, I understand that you are unable to submit a new organization validation request and are encountering with an error:
As of April 2, 2025, Microsoft has updated its Trusted Signing public preview program. The service is now limited to new customer subscriptions from organizations based in the United States and Canada with at least three years of verifiable history. As a result, organizations from other countries, are currently unable to submit new validation requests for the remainder of the public preview phase, as individual developer onboarding has been paused.
For more details, please refer to the following document:
Trusted Signing Public Preview Update
I hope this information is helpful. Please feel free to reach out if you have any further questions.