Aurion export error: Object must implement IConvertible. at System.Convert.ChangeType

When trying to export Contact_Phone_Number to Aurion I get "Other", "One or more errors occurred" reported in MIM.

The error is on the screen in the Adapter (though not in the Broker log file). I've pasted the error below.

Aurion should already be set up to allow exports to this field as the existing solution does that. I've checked the field name and mapping is the same in the Connector config file for both new and old solutions.

Broker version: 5.3.1. Revision #0

Aurion connector version: 5.3.0.0

It's trying to export a string value for two entities. The export flow rule from MIM is a direct flow and the metaverse attribute is a single-valued string.

Her's the error message from the Adapter screen:

Adapter update entities [Count:2] to adapter Aurion Personnel (549d90e8-e7df-4729-9e4c-58c73d1c98d3) failed with reason System.AggregateException: One or more errors occurred. ---> 
Unify.Product.IdentityBroker.EntitySchemaValidationException: Provided value System.Linq.Enumerable+d__14`2[Unify.Framework.DistinguishedNameValue,System.String] failed validation for type String ---> System.InvalidCastException: Object must implement IConvertible. 
at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) 
at Unify.Product.IdentityBroker.EntityObjectTypeSchemaValidator`2.CreateValue(Object dataValue) 
--- End of inner exception stack trace --- 
at Unify.Product.IdentityBroker.EntityObjectTypeSchemaValidator`2.CreateValue(Object dataValue) 
at Unify.Product.IdentityBroker.DistinguishedNameGeneratorReverseTransformation.Transform(IEntity[] sourceValue) 
at Unify.Framework.AggregateArrayedValueAdapter`2.<>c.b__2_0(TElement[] current, IValueAdapter`2 valueAdapter) 
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func) 
at Unify.Framework.AggregateArrayedValueAdapter`2.Transform(TElement[] baseValue) 
at Unify.Framework.AggregateArrayedValueAdapter`2.<>c.b__2_0(TElement[] current, IValueAdapter`2 valueAdapter) 
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func) 
at Unify.Framework.AggregateArrayedValueAdapter`2.Transform(TElement[] baseValue) 
at Unify.Product.IdentityBroker.Adapter.GetReverseTransformedEntities(IEnumerable`1 entities) 
at Unify.Product.IdentityBroker.Adapter.d__112.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() 
at Unify.Product.IdentityBroker.Adapter.d__111.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.Adapter.d__70.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.Adapter.d__69.MoveNext() --- End of inner exception stack trace --- 
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification) 
at Unify.Framework.Auditing.AuditingExtensions.<>c__DisplayClass7_0`1.b__0(Task`1 t) 
at Unify.Framework.Auditing.AuditingExtensions.<>c__DisplayClass5_0`1.b__0(Task`1 t) 
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke() 
at System.Threading.Tasks.Task.Execute() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.AdapterNotifierDecorator.d__39.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.RequestHandlers.BulkRequestEntityGroupProcessor.d__18.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.RequestHandlers.BulkRequestEntityGroupProcessor.d__12.MoveNext() ---> (Inner Exception #0) Unify.Product.IdentityBroker.EntitySchemaValidationException: Provided value System.Linq.Enumerable+d__14`2[Unify.Framework.DistinguishedNameValue,System.String] failed validation for type String ---> System.InvalidCastException: Object must implement IConvertible. 
at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) 
at Unify.Product.IdentityBroker.EntityObjectTypeSchemaValidator`2.CreateValue(Object dataValue) --- End of inner exception stack trace --- 
at Unify.Product.IdentityBroker.EntityObjectTypeSchemaValidator`2.CreateValue(Object dataValue) 
at Unify.Product.IdentityBroker.DistinguishedNameGeneratorReverseTransformation.Transform(IEntity[] sourceValue) 
at Unify.Framework.AggregateArrayedValueAdapter`2.<>c.b__2_0(TElement[] current, IValueAdapter`2 valueAdapter) 
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func) 
at Unify.Framework.AggregateArrayedValueAdapter`2.Transform(TElement[] baseValue) 
at Unify.Framework.AggregateArrayedValueAdapter`2.<>c.b__2_0(TElement[] current, IValueAdapter`2 valueAdapter) 
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func) 
at Unify.Framework.AggregateArrayedValueAdapter`2.Transform(TElement[] baseValue) 
at Unify.Product.IdentityBroker.Adapter.GetReverseTransformedEntities(IEnumerable`1 entities) 
at Unify.Product.IdentityBroker.Adapter.d__112.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() 
at Unify.Product.IdentityBroker.Adapter.d__111.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.Adapter.d__70.MoveNext() --- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
at Unify.Product.IdentityBroker.Adapter.d__69.MoveNext()<--- . Duration: 00:00:00.0156171