problems with artists and albums

Trying to retrieve artist and album links for a given artist, and running into a few issues:

#1 - If I search for artist "David Sanborn" using the endpoint https://api.soundcloud.com/users?q=David Sanborn&limit=200&offset=0&linked_partitioning=true, I get a payload with several artists of that name. Is there any way within the api to distinguish between users and actual recording artists?

#2 - Assuming I land on the right user id (203409966), I then want to retrieve all albums featuring David Sanborn. For this, I use the endpoint https://api.soundcloud.com/users/soundcloud:users:203409966/playlists?linked_partitioning=1&page_size=200&show_tracks=false and everything looks good in that I see a partial list of albums by David Sanborn. However, next_href in this payload reads as follows: https://api.soundcloud.com/users/soundcloud:users:203409966/playlists?cursor=1978-05-10T00%3A00%3A00.000Z%2Cplaylists%2C00000000000244135998&linked_partitioning=1&page_size=200&show_tracks=false and when I issue that request, I receive a response code of 200 but a payload as follows:

{
    "collection": [],
    "next_href": null
}

What am I missing here? Do I need to modify the next_href before sending it to get it to work, and if so, how?

Thank you.

Start by reproducing the artist search and playlist pagination requests for user 203409966 using the endpoints and next_href shown in the report. Determine whether the API provides a way to distinguish recording artists from similarly named users and why the returned cursor produces an empty collection. Done means a confirmed API behavior or fix, with the required request documented.