I am trying to build an automation that will move my Slack channels to different sidebar sections depending upon strings present within the channel names. I haven't found public-facing API documentation that covers any endpoints related to sidebar sections, but I did observe the following when testing with section manipulation in Slack's browser application:

users.channelSections.channels.bulkUpdate

Method: POST
Request URL: https://.slack.com/api/users.channelSections.channels.bulkUpdate?_x_id=&_x_csid=&slack_route=&_x_version_ts=1651772834&_x_gantry=true&fp=5e

remove: []
insert: [{"channel_section_id":"","channel_ids":[""]}]
token: 
_x_reason: channel-sidebar-channel-drop
_x_mode: online
_x_sonic: true

There is also users.channelSections.create, which appears to be involved in the creation of new sidebar sections.

I've attempted to use these endpoints, to no avail. As far as I can tell, I'm making the appropriate call, but the server returns status code 200 with the message not_allowed_token_type.

I've tested with various tokens, including the bot tokens prepended with xoxb, and my user token prepended with xoxp. In the browser, the token is prepended with xoxc, and my attempts to use this token in a direct call have resulted in the same not_allowed_token_type message with a status code of 200.

Has anyone worked with these endpoints before? It seems strange that they'd be undocumented. Any advice for next steps to try would be welcome.