[SalesForce] Journey Builder – Business Rule Disabled

Login to your marketing cloud account and go to the platform tab and click on Extension Manager. You should see JB for Mobile Connect and JB for Mobile Push as options. Click on Manage and search for the user you want to provision. Make sure a check mark is there against the user. Logout and log back in to check if this enables the required activities.

Great thinking so far ! :) I think I can answer most, if not all of your concerns. First of all, and just for your reference - synchronised data extensions exists as "hidden populations" via the connector, so if all your data is coming from salesforce, an all communications are initiated through that, you should be safe - but i agree with your proposal:

• Create automation with two query activities to represent the two populations

As for the second part - Michael is correct in that you could pass the correct id via the api call (but do note, that you need to use the PersonContactId, ContactId or LeadId as the subscriber key - this is a requirement for the connector. MC Connect operates based on what can go into a "WhoId" field inside salesforce core)

Based on you second story though, unless there is a specific payload that you need to pass via the API call, I would offer a different solution - namely to use Salesforce Triggered Sends or Journey Builder combined with Salesforce Data Entry. Essentially, you are creating a record with certain parameters inside salesforce core - and then based on those parameters, you leverage marketing cloud connect's native features to push them onto a journey or triggered send based on the record creation and/or field updates.

Alternatively, as long as you make sure that you have the right Id passed as part of the API call, as michael says, you should be safe. (right id is not equal to account id)