unable to read tags from App.config

[stochmal]

<add key="serilog:write-to:DatadogLogs.tags" value="name:dev,owner:trading,application:fti" />

trying to read above entry generates error:

System.InvalidCastException
HResult=0x80004002
Message=Invalid cast from 'System.String' to 'System.String[]'.
Source=mscorlib
StackTrace:
at System.Convert.DefaultToType(IConvertible value, Type targetType, IFormatProvider provider)
at System.String.System.IConvertible.ToType(Type type, IFormatProvider provider)
at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
at System.Convert.ChangeType(Object value, Type conversionType)
at Serilog.Settings.KeyValuePairs.SettingValueConversions.ConvertToType(String value, Type toType)
at Serilog.Settings.KeyValuePairs.KeyValuePairSettings.ConvertOrLookupByName(String valueOrSwitchName, Type type, IReadOnlyDictionary2 declaredSwitches) at Serilog.Settings.KeyValuePairs.KeyValuePairSettings.<>c__DisplayClass26_0.<ApplyDirectives>b__1(<>f__AnonymousType32 <>h__TransparentIdentifier0)
at System.Linq.Enumerable.<>c__DisplayClass7_03.<CombineSelectors>b__0(TSource x) at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()
at System.Collections.Generic.List1..ctor(IEnumerable1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source) at Serilog.Settings.KeyValuePairs.KeyValuePairSettings.ApplyDirectives(List1 directives, IList1 configurationMethods, Object loggerConfigMethod, IReadOnlyDictionary2 declaredSwitches)
at Serilog.Settings.KeyValuePairs.KeyValuePairSettings.Configure(LoggerConfiguration loggerConfiguration)
at Serilog.Configuration.LoggerSettingsConfiguration.Settings(ILoggerSettings settings)
at Serilog.Configuration.LoggerSettingsConfiguration.KeyValuePairs(IEnumerable`1 settings)
at Serilog.Settings.AppSettings.AppSettingsSettings.Configure(LoggerConfiguration loggerConfiguration)
at Serilog.Configuration.LoggerSettingsConfiguration.Settings(ILoggerSettings settings)
at Serilog.AppSettingsLoggerConfigurationExtensions.AppSettings(LoggerSettingsConfiguration settingConfiguration, String settingPrefix, String filePath)