SRA failover reports N2Dr3Xml20XmlValidateExceptionE error promoting devices

The SRA failover operation fails to complete with the message below:

Failed to promote replica devices. A general system error occurred: N2Dr3Xml20XmlValidateExceptionE value '' does not match regular expression facet '[+\-]?[0-9]+'...

In the OTV application.log file, the logs report errors similar to the below:

{"stream":"stdout","log":"{"timestamp":"2025-10-31T14:51:54.5476220Z","level":"info","message":"UpdateErrorMessage: Job document updated Received status: 500 as response status with response = {"error":{"message":"Exception : [400 Bad Request] during [PATCH] to [https://<cluster IP>:443/api/protocols/nfs/export-policies/###?return_records=true] [ExportPolicyFeignClient#modifyExportPolicy(URI,String,ExportPolicy)]: [{\\n  \\"error\\": {\\n    \\"message\\": \\"The export policy was not created because of duplicate export policy rules present in the request.\\",\\n    \\"code\\": \\"1704071\\"\\n  }\\n}]","code":500}