SharePoint sync shows this error:
[810339] Could not insert object into SharePoint Online site collections because object in Time zones referenced by the property Time zone does not exist.
This issue can be resolved by changing the region from "Spain traditional" to "Spain" on the affected server(s).
Microsoft article for more details on changing the region:
https://support.microsoft.com/en-us/office/change-regional-settings-for-a-site-e9e189c7-16e3-45d3-a090-770be6e83c1a
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