The API page about Stack Overflow for Teams says (emphasis mine):
Starting with the release of Stack Overflow For Teams, the Stack Exchange API exposes read-only access to data stored in private Teams.
In addition to all write methods, the following methods (and their
/meequivalents) are not supported
However, the API methods listed under Articles on the main documentation page do talk about write operations:
Add/Edit/Delete Only available for Business Teams via the Teams API.
Can a staff member add some clarification to the documentation to what the actual situation is? Is it now possible to perform 'regular' write operations (e.g. ask a question) on Teams? Or are the Articles methods the only exception?