The first step is to generate a new registration key for the existing Azure Virtual Desktop host pool. This key, generated via the Azure portal under the "Registration key" option of the specific host pool, is necessary to authorize the new session hosts in the different region to join the existing pool.
Key steps to proceed:
1. Generate Registration Key: In the Azure portal, go to your host pool, select Registration key, and click Generate new key.
2. Deploy New Hosts: Navigate to the host pool and select + Add to begin adding session hosts, ensuring you select the new region.
3. Use Key: Use this new key during the deployment process of the new session hosts in the different region.
Reference:
https://docs.azure.cn/en-us/virtual-desktop/add-session-hosts-host-pool