When Device Telemetry is disabled on Panorama, Commit fails with error message: "region is invalid"

• The commit failed the validation error "region is invalid".
• It happens when an administrator disabled device telemetry.
• Here are the example of the error on Panorama managed PrismaAccess.

Validation Error: 
devices -> localhost.localdomain -> template-stack -> Service_Conn_Template_Stack -> config -> devices -> localhost.localdomain -> deviceconfig -> system -> device-telemetry -> region is invalid
devices -> localhost.localdomain -> template-stack -> Explicit_Proxy_Template_Stack -> config -> devices -> localhost.localdomain -> deviceconfig -> system -> device-telemetry -> region is invalid
devices -> localhost.localdomain -> template-stack -> Mobile_User_Template_Stack -> config -> devices -> localhost.localdomain -> deviceconfig -> system -> device-telemetry -> region is invalid
devices -> localhost.localdomain -> template-stack -> Remote_Network_Template_Stack -> config -> devices -> localhost.localdomain -> deviceconfig -> system -> device-telemetry -> region is invalid

• Any Panorama
• PAN-OS 10.0
• Device Telemetry

• The error caused if the firewall has invalid schema in the configuration. 
• Such error can be seen in configd.log (less mp-log configd.log).

2021-07-30 15:43:20.284 +0900 Error:  _pan_schema_verify_node(pan_schema_obj.c:7195): is invalid , node: region near line 7452
2021-07-30 15:43:20.291 +0900 Error:  _pan_schema_verify_node(pan_schema_obj.c:7195): is invalid , node: region near line 7427
2021-07-30 15:43:20.296 +0900 Error:  _pan_schema_verify_node(pan_schema_obj.c:7195): is invalid , node: region near line 7402
2021-07-30 15:43:20.347 +0900 Error:  pan_cfg_verify_ex(pan_cfg_commit_handler.c:2723): invalid configuration. Schema verification failed.  

1. Select the region by the following command, and commit it once. The schema will be corrected by this operation.

   > configure
   # set template-stack <Template Stack name> config devices localhost.localdomain deviceconfig system device-telemetry region <region name>
   # commit

2. After that, you can select "none" as the region for the device telemetry. On the CLI, you can delete the region by this command.

   # delete template-stack <Template Stack name> config devices localhost.localdomain deviceconfig system device-telemetry region <region name> 
   # commit
   # exit
   

3. In some cases, we can try following commands as well.

   # set deviceconfig system device-telemetry region <region name> product-usage yes device-health-performance yes threat-prevention yes 
   # commit