YouMail needs cellular data to successfully forward your calls
Since the activation codes attempt to add a forwarding number in your carrier's "Conditional Call Forwarding" setting, a strong connection is needed to make these changes. Some common error codes with poor connection are OCN and MMI.
Wi-Fi calling, while it enhances your connection, does not supplement the issues of poor cellular connection. Using Wi-Fi for the activation codes will result in the same errors, as cellular data is needed to make changes in your carrier settings.
See Also:
Why Do My Voicemails Still Go to My Carrier's Voicemail?
Activating YouMail on an Unlocked Phone
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