Documenting earlier fix: My exisiting Dolphin site has a Premium membership level, and that caused issues migrating. So... the SQL below run against the Una database renamed the key for the built in premium level allowing mine to import.

UPDATE sys_acl_levels
	SET sys_acl_levels.Name = "_adm_prm_txt_level_unapremium"
	WHERE sys_acl_levels.name = "_adm_prm_txt_level_premium"
;

UPDATE sys_localization_keys
	SET sys_localization_keys.Key = "_adm_prm_txt_level_unapremium"
	WHERE sys_localization_keys.Key = "_adm_prm_txt_level_premium"
;

UPDATE sys_localization_strings
	SET sys_localization_strings.String = "UnaPremium"
	WHERE sys_localization_strings.String = "Premium"
;