Trouble Creating Resource Mailboxes in M365 Exchange Online

I'm having issues creating new resource mailboxes, like room or equipment calendars, in M365 Exchange Online. I keep getting the error: "Error executing request. An Azure Active Directory call was made to keep the object in sync between Azure Active Directory and Exchange Online. However, it failed. Detailed error message: Cannot convert a primitive value to the expected type 'Edm.Int64'." I've tried multiple times over several hours, but no luck. Since we're fully using Exchange Online without any on-premise Exchange, I expected mailbox creation events to show up in the Purview audit log, but there's nothing there, not even errors. Interestingly, modifications to existing resources work just fine; for instance, changing a display name updates it in Entra without issues. I checked the M365 admin center service health section, but everything seems normal. Has anyone else encountered this problem, particularly in the north EU?