Please use the virtual functions instead, Virtual functions (from ConfiForms version 1.16+)
Yes, this could be tricky.
The values are actually stored as an array and you should use Velocity foreach loop to get them.
Let's assume that the multi-select user field is named: Requestor (ConfiForms Field Definition's field name)
Then to get the values stored in this field in IFTTT macro body (to create a page or send an email) you will need to do the following:
This will loop all the requestors and output their full names.
Which fields are available for the user object you can see here in more details: Documentation
But generally for user objects the following fields are exposed:
This example is valid for other types of multi-select fields. The only difference is that the values stored inside the field is not a rich object, but a simple text (varchar) value.
So you will reference it's value like this: