@Yannick Bastiaensen Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
As per your screenshot, it states, Azure Storage account has been created! Can you relaunch the Postman and try to create a New Storage account, You can also view the details as mentioned below
Please let us know if you have any further queries. I’m happy to assist you further.
----------
Please do not forget to and wherever the information provided helps you, this can be beneficial to other community members.