problème de synchronisation avec microsoft 365

j'ai ce message d'erreur Constraint SQLite.SQLiteException: Constraint at SQLite.PreparedSqlLiteInsertCommand.ExecuteNonQuery(Object[]) + 0x2c2 at SQLite.SQLiteConnection.Insert(Object, String, Type) + 0x356 at CalendarApp.SQLite.Repositories.RepositoryBase1.Insert(T) + 0x3a at CalendarApp.SQLite.Repositories.CIExpandedRepository.Insert(CIExpandedDataEntity) + 0x70 at CalendarApp.ProviderBase.StorageManager8.AddCIExpanded(Transaction, ICalendarItem) + 0x16a at CalendarApp.ProviderBase.AccountProviderBase9.UpdateExpandedDataForAppointment(Transaction, TCachedAppointment) + 0x1ff at CalendarApp.ProviderBase.AccountProviderBase9.UpdateAppointmentAndExpanded(Transaction, TCachedAppointment) + 0xcc at CalendarApp.MicrosoftGraphProvider.MicrosoftGraphAccount.d7.MoveNext() + 0xb08 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17 at CalendarApp.MicrosoftGraphProvider.MicrosoftGraphAccount.d6.MoveNext() + 0x2c8 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17 at System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0xb at CalendarApp.ProviderBase.AccountProviderBase`9.d99.MoveNext() + 0x21b que puis je faire ?