I am not able to schedule in story points after the 11/23/20 update using a scrum board.
After updating 'issue sources' and clicking on 'scheduling' the 'story points' radial button is enabled for a split second; then disabled, and the 'hours' radial button is enabled.
Noting the error shown on your screen grab, I checked the documentation... It says that once a Kanban board is associated to plan story points cannot be used.
Please check for any Kanban boards associated to the plan on the roadmap.
Chris, sorry but I only have the basic roadmap so I cannot try to replicate this; I do not have the scheduling feature.
How about this: are any epics on the board associated to work items which are included on any Kanban boards, perhaps in other projects?
If not, try this:
If so, I would submit a defect for this as you appear to be on a paid-instance and you are a site admin:
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