Is it possible to $expand multiple attributes. For example:
This will result in an error.
The result of parsing $expand contained at least 2 items, but the maximum allowed is 1.
Please refer to document($expand section) :
If you query on the user resource, you can use $expand to get the properties of only one child object or collection at a time.
And here is a discussion about same topic :
However, specific entities may still have limits and for users it is still limited to a single expanded navigation. That is not expected to change.