Thank you for reaching out.
I understand you wish to become Azure express route service provider. I have shared an internal alias with you in a private message here. You can reach out to that alias to initiate this process and product group will share the next steps required in this process.
Community members: If you have similar request, please create a new question on this forum so that we can share the alias in a private message with you.
https://learn.microsoft.com/en-us/answers/support/private-messages
Hope this helps! Please let me know if you have any additional questions. Thank you!
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.