In SFDC we set up a Lead and Contact Lead Source fields that maps to "Source" in MK. However, when i attempt to update this field in MK so to update SFDC the attribute is not available in the list to be able to update. I do not have this field blocked from updates either. I was able to update the field from SFDC > MK so there is a value in the field, but it does not look like it is available to be updated via flow step.
If i choose to update Lead Source it does not flow from Marketo > SFDC as that field looks like it is for SFDC opportunity creation only, which we will not be using Marketo for this function.
What am i missing here?