Hi there, I had a similar issue with Office 2024 Professional Plus. After entering the product key, I was also redirected to the outage page regardless of browser or version selected.
From what I've researched, this usually happens when the product key is from a volume license or MSDN channel that isn't supported by the standard retail download site. Here's what I recommend based on my experience:
Check if your key is Volume Licensed: Try signing in to the Volume Licensing Service Center to see if your product is listed there.
Use the Office Deployment Tool: You can install Office using a custom config file and the official Office Deployment Tool. This method bypasses the broken web installer. If needed, I can help you build the XML file.
Contact Microsoft Support Directly: They may provide you with a direct download link or help convert your key to a format that works.
Unofficial but safe option: Use the Heidoc Office Download Tool to get an official ISO directly from Microsoft's servers.
Hope this helps someone else facing the same frustrating issue!