Hello @Đặng Hoàn Mỹ Thanks for using Microsoft Q&A Platform.
Are you using selected networks on the resource? If yes, kindly make sure your device IP is added to the list of authorized IPs.
Are you able to use the service from SDK/API and facing this issue only in the studio? Or are you not able to use the service at all?
Try and deploy a new resource without any restrictions and test if you can use the studio or not. Try in in at least two different regions and observe the behavior.
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.