Unfortunately, there is no PowerShell cmdlet or any other way do to this yourself, outside of that dumb wizard UI. If it's still giving you trouble, your best option is to contact support - open a case via the portal (same UI) or call them directly: https://learn.microsoft.com/en-us/microsoft-365/business-video/get-help-support?redirectSourcePath=%252fen-us%252farticle%252fContact-Office-365-for-business-support-32a17ca7-6fa0-4870-8a8d-e25ba4ccfd4b&view=o365-worldwide#BKMK_call_support
Just in case, run the following cmdlet to go past the "dehydrated" issue, then give it some time and try the UI again:
Enable-OrganizationCustomization