What to do when can't find Microsoft SQL Server error explanation

Question

Following this doc View or Change the Default Locations for Data and Log Files for SQL Server 2016. I am attempting a simple change of location for data/log/backup files in MSSM.

• Connect in Object Explorer
• Login to localdb
• Right-click on localdb instance and choose Properties
• Choose Database Settings
• Attempt to change file paths (single/multiple instances) to a subfolder (with rights) of default folder

Logged into database using Windows Authentication using the following credentials:

• (localdb)\MSSQLLocalDB
• Laptop\user

I am using the following version of Microsoft SQL Server Management SQL (Have tried this both in standard/(Administrator) modes)

Server Management Studio                        15.0.18424.0
SQL Server Management Objects (SMO)                     16.100.47021.0+7eef34a564af48c5b0cf0d617a65fd77f06c3eb1
Microsoft Analysis Services Client Tools                        15.0.19750.0
Microsoft Data Access Components (MDAC)                     10.0.19041.2604
Microsoft MSXML                     3.0 6.0 
Microsoft .NET Framework                        4.0.30319.42000
Operating System                        10.0.19044

Error message from here:

===================================

Alter failed for Settings 'Microsoft.SqlServer.Management.Smo.ObjectKeyBase'.  (Microsoft.SqlServer.Smo)

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For help, click: https://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=16.100.47021.0&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Alter+Settings&LinkId=20476

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Program Location:

   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.AlterImpl()
   at Microsoft.SqlServer.Management.SqlManagerUI.ServerPropDBSettings.SendDataToServer()
   at Microsoft.SqlServer.Management.SqlManagerUI.ServerPropDBSettings.OnRunNow(Object sender)
   at Microsoft.SqlServer.Management.SqlMgmt.PanelExecutionHandler.Run(RunType runType, Object sender)
   at Microsoft.SqlServer.Management.SqlMgmt.SqlMgmtTreeViewControl.DoPreProcessExecutionAndRunViews(RunType runType)
   at Microsoft.SqlServer.Management.SqlMgmt.SqlMgmtTreeViewControl.ExecuteForSql(PreProcessExecutionInfo executionInfo, ExecutionMode& executionResult)
   at Microsoft.SqlServer.Management.SqlMgmt.SqlMgmtTreeViewControl.Microsoft.SqlServer.Management.SqlMgmt.IExecutionAwareSqlControlCollection.PreProcessExecution(PreProcessExecutionInfo executionInfo, ExecutionMode& executionResult)
   at Microsoft.SqlServer.Management.SqlMgmt.ViewSwitcherControlsManager.RunNow(RunType runType, Object sender)

===================================

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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Program Location:

   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery(String sqlCommand, ExecutionTypes executionType, Boolean retry)
   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery(StringCollection sqlCommands, ExecutionTypes executionType, Boolean retry)
   at Microsoft.SqlServer.Management.Smo.ExecutionManager.ExecuteNonQuery(StringCollection queries, Boolean retry)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.ExecuteNonQuery(StringCollection queries, Boolean includeDbContext, Boolean executeForAlter)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.AlterImplFinish(StringCollection alterQuery, ScriptingPreferences sp)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.AlterImplWorker()
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.AlterImpl()

===================================

RegCreateKeyEx() returned error 5, 'Access is denied.' (.Net SqlClient Data Provider)

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For help, click: https://docs.microsoft.com/sql/relational-databases/errors-events/mssqlserver-22002-database-engine-error

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Server Name: (localdb)\MSSQLLocalDB
Error Number: 22002
Severity: 16
State: 1


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Program Location:

   at Microsoft.SqlServer.Management.Common.ConnectionManager.ExecuteTSql(ExecuteTSqlAction action, Object execObject, DataSet fillDataSet, Boolean catchException)
   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery(String sqlCommand, ExecutionTypes executionType, Boolean retry)

Results from error message help suggestions

• first "For help" link leads to advertising
• second database errors results in 404 error
• follow links of 404 page to database errors listed by number
• using quoted error number Error Number: 22002 for SQL Server 2016 I find there isn't one?

Even using the provided script for doc Database Engine events and errors (22000 to 22999) does not produce an explanation for Error Number: 22002

Does anyone have an idea for what more I could do? Any would be appreciated.