Office activation will accept product key and go to next screen and when you click redeem it takes you to 64/32 bit page when you click 64 bit it goes to SERVICE UNAVAILABLE.

I'm afraid that the AI-generated response from Q&A Assist is correct. There are no consumer licenses of Office Professional 2024 or Office Professional Plus 2024; these are volume licenses intended for (large) organizations, only (see https://learn.microsoft.com/en-us/office/ltsc/2024/overview ).

You will have to contact the seller and try to get your money back.

Office 2024 Professional Plus is a volume license product intended for organizations, not for home/consumer use. It is not sold directly to individual users by Microsoft, and volume licenses such as “Professional Plus” cannot be legitimately resold for home use.

When a key for this type of product is entered on setup/activation sites intended for retail or home products, download and activation issues are expected (including “Service unavailable” or being unable to obtain the correct installer), because the infrastructure and entitlement model are different from consumer Microsoft 365/Office products.

Given that:

1. Office “Professional Plus” 2024 is a volume license SKU.
2. Volume licenses are meant for organizations and are not supposed to be sold as “lifetime” home licenses.
3. Third‑party sellers offering such keys to consumers are typically violating Microsoft’s licensing terms.

The appropriate next step is to dispute the purchase with the seller (and, if needed, with the payment provider) and request a refund, as this license type is not supported for home use via the standard consumer download/activation flow.

For a supported desktop Office experience at home, a genuine retail Microsoft 365 or perpetual Office (non‑“Plus”) license purchased through official Microsoft channels or reputable retailers is required.

References:

• problem with active office key - Professional Plus Office 2024
• http://offline.officeapps.live.com/outage.html - Microsoft Q&A
• installed MS office 2024, got 2021, how to fix this? - Microsoft Q&A
• After installing my MS LTSC Professional Plus 2024, when i try to activate over the internet it reports that product key has already been used, but this is my first installation - Microsoft Q&A
• "Product key is not valid" error when activating Office
• Office product key errors ERR_MISSING_PARTNUMBER or ERR_INVALID_TOKEN
• Download, install, or reinstall Microsoft 365 or Office 2024 on a PC or Mac