The description on the Wiki for /sponsor says:

Marks you as the sponsor of the pull request. A pull request made by a contributor who is not a Committer can not issue the /integrate command until a Committer in the project has issued the /sponsor command.

Yet, I've just tried issuing /sponsor on https://github.com/openjdk/jdk/pull/94 and it said[1]:

"""
@jerboaa The change author (@galderz) must issue an integrate command before the integration can be sponsored.
"""

[1] https://github.com/openjdk/jdk/pull/94#issuecomment-690127901

Please change the description on the Wiki to reflect the right workflow: 1. sponsee => /integrate 2. sponsor => /sponsor. Not the other way round.