Thank you, @kkeefer1313! 😊
If everything is configured correctly, Marketo Program - SFDC Campaign sync is enabled (ideally, if that’s the case you shouldn’t be using SFDC flow steps to add people to campaign/change their campaign status), and the fields are mapped then you should ideally see the PMCF data updates getting synced over to the respective campaign member fields in SFDC. As Sandy says in the other thread linked above, the feature is set to work ONLY with the OOTB Marketo Program and SFDC campaign sync turned on, w/o it you won't see the PMCF updates syncing to the respective SFDC campaign member fields even though the fields are mapped in the Admin. I'd recommend you turn on the program - campaign sync and try.