Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear Craig,
I'm sorry you've been going in circles on this, especially with a server problem waiting to be fixed. Unfortunately, as a forum moderator, I am not able to purchase support or open a case on your behalf. My role here is limited to providing general guidance you can apply from your side.
The "no eligible support plan" message suggests your work account doesn't have a support plan linked to it in Engage Center. Engage Center is the channel Unified/Premier customers use to open tickets, so the message can appear when the signed-in account doesn't have one of those plans. Pay-per-incident support is linked to the Microsoft account used to purchase it, so trying with your personal account was the right approach.
For the page that keeps loading, a few things worth checking before you try again:
Use a private browser window with extensions, ad blockers and VPNs turned off.
Allow cookies and pop-ups for Microsoft sites, and set tracking prevention to Balanced if you use Edge.
Make sure your personal Microsoft account has a country/region and billing details set at account.microsoft.com.
It's also worth confirming that your server product is still within its support lifecycle, since products out of lifecycle aren't covered.
For reference: Microsoft Professional Support (pay-per-incident): FAQ | Microsoft Support
I hope this information is helpful and provide you with a clear path forward. Should you have any further questions or need additional assistance, please don't hesitate to reach out. I'm always happy to help. Have a wonderful day!