It took me serveral hours to understand that the scope variable needs to be set to "https://management.azure.com/.default"
Follow the setup guide on https://www.drupal.org/project/azure_cdn_purge → It does not mention what to enter as scope or where to find the scope. The linked documentation is also not helpful regarding this.
On top of this, the test page of the CDN reports that the CDN was purged succesful even if the token request or the purge operation failed.
Add a sentence that explains the value of the scope should be "https://management.azure.com/.default".
Please also mention that the API version should be set to "2021-06-01".
Validate the response codes and provide a meaningful error message (or any error message at all) if the purging failed on the test page.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
@phgampe thanks for your feedback! I will be reviewing some changes over the next few weeks and will make sure to implement your feedback.
+1 for these changes. I spent hours trying to get this working until I came across this issue.