Hello LOLO,
My name is Oluwatosin and I’ll be more than happy to help you with your query." This is a user-to-user community forum. We do not have access to your account.
I'm sorry to hear that you're having trouble syncing emails in New Outlook.
Try resetting the Outlook app.
Open Settings on Windows > Select Apps and Features Select the Outlook app, click on Advanced options > and scroll down to select Reset.
To switch to Classic Outlook, Search for Outlook (not New) on your device, as both Outlook apps should be available on your PC.
I hope this helps! Let me know if you have any questions.
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Best regards, Oluwatosin.