Hi,
Did you want to change the update channel for Office 365?
If yes, I suggest you refer to this support article:
As the article said, please double-check these items:
Make sure the scheduled task "Office Automatic Updates 2.0" is enabled on the client devices. This task, which updates the assigned channel, is a required part of managing updates for Microsoft 365 Apps, whether you use Group Policy, the Office Deployment Tool, Configuration Manager, or Intune.
- Make sure that the update channel for the targeted device isn't set through Group Policy. Otherwise, the policy setting will take precedence over the Office Deployment Tool setting and the device will stay on the channel specified by the policy setting. In such case, either remove the policy setting from the device or use Group Policy to change the channel.
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