Resolving and migrating required "Managed Metadata operation has timed out" error when copying a sub site from SP 2013 to SPO (4315938)

Error: The operation has timed out

Stack:    at System.Net.HttpWebRequest.GetResponse()

   at Microsoft.SharePoint.Client.SPWebRequestExecutor.Execute()

   at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuilder sb)

   at Microsoft.SharePoint.Client.ClientContext.ExecuteQuery()

   at Metalogix.SharePoint.Adapters.CSOM2013.ClientContextExtension.ExecuteQueryWithIncrementalRetry(ClientRuntimeContext context, Int32 retryCount, Dictionary`2 privateData, Int32 delay)

   at Metalogix.SharePoint.Adapters.CSOM2013.CSOMAdapter.CallExecuteQuery(ClientRuntimeContext ctx, SharePointAdapter callingAdapter)

   at Metalogix.SharePoint.Adapters.CSOM2013.CSOMAdapter.GetTermSetCollection(String termStoreId, String termGroupId)

   at Metalogix.SharePoint.Taxonomy.SPTermSetCollection.FetchData()

   at Metalogix.SharePoint.Taxonomy.SPTermGroup.get_TermSets()

   at Metalogix.SharePoint.Taxonomy.SPTermStore.get_TermSetLookupCache()

   at Metalogix.SharePoint.Taxonomy.SPTermStore.FindTermSet(Guid termSetGuid)

   at Metalogix.SharePoint.Taxonomy.SPTermStore.GetTermSetHierarchy(Guid termSetGuid, Boolean returnSiteCollectionGroupName)

   at Metalogix.SharePoint.Actions.Migration.CopyTaxonomyAction.GetDistinctGroupAndTermSetsForTermstore(ITaxonomySiteConnection sourceSite, Guid termStoreId, IList`1 termSets)

   at Metalogix.SharePoint.Actions.Migration.CopyTaxonomyAction.CopyRequiredManagedMetadata(IDictionary`2 requiredManagedMetadata, ITaxonomySiteConnection sourceSite, ITaxonomySiteConnection targetSite)

Type: System.Net.WebException

HResult:-2146233079

Data Item 'ClientRequest':

Microsoft.SharePoint.Client.ClientRequestWrapper

1. Using CSOM as a source connection type which is not a recommended connection type for source SP 2013 On-premises

2. Selected both "Resolve Managed Metadata by name and hierarchy" and "Copy referenced managed metadata" and these options are not required to select if the GUIDS are same between both source and target