Here's what I got through tech support. I'm not terribly optimistic:

Hello United,

I recently set up an account a United Gift Registry. One gift was added earlier this month, but the site has been down for more than a week.

Is United ending the Gift Registry program? Or do you know when the site will be back up?

Thank you,

mystryda

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Dear mystryda:

Thank you for contacting United.com Web Support.

We’re sorry, our gift registry page is currently unavailable for maintenance. You can still use the funds from your gift registry to book travel during this time, but you will not be able to receive contributions or update your registry details. Please check back at a later date.

Sorry for the inconvenience this may cause.

Thank you for using united.com.

Regards,

CSR
United.com Web Support

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Dear CSR,

Thank you for confirming that it's down for maintenance.

It's been down for maintenance for a week already. Do you know when it will be back up?

Thanks,

mystryda

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Dear mystryda:

Thank you for contacting united.com Web Support Desk. I apologize for the delay in this response to your e-mail correspondence.

Currently, we do not have a time frame when this will be resolved. We apologize for the inconvenience this may have caused.

We appreciate your e-mail and look forward to welcoming you onboard United Airlines.

Regards,

Pernell C.
United.com Web Support Desk