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Error 0x0 usually indicates that Office cannot correctly identify the active license, which can happen when several Microsoft accounts or older license details are stored on the device.
Please sign in to Services & subscriptions using each Microsoft account you may have used, and confirm which account shows the active Office or Microsoft 365 license. Then sign out of all accounts in Word or Excel under File > Account, restart the app, and sign back in only with that licensed account.
If the error continues, could you confirm whether you are using Windows or macOS, and whether the license is Microsoft 365 or a one-time Office purchase? The appropriate license-reset steps are different for each platform