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Hi RaGau
Typically, if you make changes through the Admin Center, it can take up to 24 hours for the changes to take effect. You may try again after 24 hours, or alternatively, you can use PowerShell to apply the changes immediately.
Based on your description, for more details, please refer to this document: Enable-OrganizationCustomization (ExchangePowerShell) | Microsoft Learn
I hope this information helps and if you have any question, please feel free to ask via comment section,
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