@test wps
Thank you for your question!
- Has that call ever worked before? If so, when was the last time it worked?
- Can you try changing your URL from:
"https://microsoftgraph.chinacloudapi.cn/v1.0/me/mailFolders/microsoft.graph.delta" to "https://graph.microsoft.com/v1.0/me/mailFolders/microsoft.graph.delta"
Looking through the Get mailFolder API documentation and testing this out myself, I found that if I ran the same url you did, I got a 401 error rather than 400:
https://microsoftgraph.chinacloudapi.cn/v1.0/me/mailFolders/microsoft.graph.delta
However, when I changed the URL from "microsoftgraph.chinacloudapi.cn" to "graph.microsoft.com" I was able to make a successful call.
https://graph.microsoft.com/v1.0/me/mailFolders/microsoft.graph.delta
I hope this helps! If you have any other questions, please let me know.
Thank you for your time and patience throughout this issue.