Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are following the steps mentioned in Migrate Azure CDN from Microsoft (classic) to Standard/Premium tier
In the same doc, I see a "Abort Migration" button.
- Can you check if this is greyed out/unavailable for you?
- If yes, you must file a support ticket where a support engineer can check the backend logs to pinpoint the issue
Cheers,
Kapil