I also keep getting this error below in the C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\LogFiles\RSManagement_*_**__**.log file.
Error Number:-2,State:0,Class:11
2021-05-11 13:01:13.3116|WARN|13|Symmetric Key Encryption access data is missing or corrupt| RequestID = s_9e875818-00c0-49e9-8d57-1dbb79fd22b1 System.Data.SqlClient.SqlException (0x80131904): Execution Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception (0x80004005): The wait operation timed out
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
at System.Data.SqlClient.SqlDataReader.get_MetaData()
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader()
at Microsoft.BIServer.Configuration.Key.KeyRepository.GetEncryptedSymmetricKey(InstallationInfo installationInfo)
at Microsoft.BIServer.Configuration.Key.KeyRepository.ReloadEncryptedSymmetricKey()
at Microsoft.BIServer.Management.WebApi.Controllers.StateController.ReloadEncryptedSymmetricKey(ISqlAccess sqlAccess, Byte[]& encryptedSymmetricKey, DatabaseValidationStatus databaseValidationStatus)
ClientConnectionId:c9759d0b-0a25-4d42-81a5-2b010a6c2ea4
Error Number:-2,State:0,Class:11