If you can provide the JSON of your request and response and a screenshot of how the Smart List in your campaign is set up, it will be easier to troubleshoot what's going wrong.
I am able to query Campaigns without a value for isTriggerable. What is making you think it's mandatory? Are you getting an error code (and if so, which one)?
The merge process is encountering a Salesforce error while initiating the merge. To get the details of which error Salesforce is returning you'll need to file a Marketo support tic...
It depends. If you're sending the email through the Outlook or Gmail Sales Insight plugins then unsubscribe is not respected since that is a true 1:1 communication (and also not se...
Can you explain your entire process of how you're tracking this in Marketo? Where you are trying to see it (Smart List? Lead Record?), how you're trying to retrieve it (Smart List ...
That would be your Engagement Manager or Customer Success Manager. Customer Support doesn't support or initiate that process, it is a Professional Services engagement.
You've hit your limit for Segmentations. Segments are the different buckets that make up a segmentation and their limit is 100. This must be your 21st Segmentation you're trying to...