On the ClickUp website, all plans from Unlimited and above are advertised as offering UNLIMITED INTEGRATIONS, including with OneDrive. But if you try to activate the OneDrive integration under the Unlimited or Business plans, you are told that it isn't included in your plan and to upgrade to Business Plus at 29$/month. +19$ more than the advertised plan.

I flagged this issue to ClickUp support in late January 2025.

This screen shot was taken mi-February.