When using Flow to archive Sharepoint Items from one list to another SHarepoint list, the support for all SHarepoint Fields is missing and make Flow almost unusable for archiving.
Here are the issues, the Create Item lacks support for
Multi-valued Person Fields
Multi-Valued Lookup Fields
Multi-valued Choice Fields
When the source item (in a copy kind of action) for a Lookup field is null (no value was selected), the Create Item throws an error because it can not handle setting the lookup field to Null. This issue is similar to SHarepont Designer issues dealling with null lookup fields.