Looks like we finally have a solution.

Change logging to just log a message, instead of the exception.
Moved logic to Syncer involvement.  When posting the data, if a 500 is
returned, then it is up to the Syncer to re-submit it.

FreeTubeSync/Model/BaseModel.cs

@@ -0,0 +1,17 @@
+using System.Collections;
+
+namespace FreeTubeSync.Model;
+
+public class BaseModel
+{
+    public void UpdateFrom(object other)
+    {
+        foreach (var prop in other.GetType().GetProperties())
+        {
+            if (prop.Name == "_id" || prop.Name == "id" || prop.Name == "Id" || prop.Name == "subscriptions" || prop.Name == "videos")
+                continue;
+            var val = prop.GetValue(other);
+            prop.SetValue(this, val);
+        }
+    }
+}