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.
Why Do My Voicemails Still Go to My Carrier's Voicemail?
Activating YouMail on an Unlocked Phone
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