Dear, brillb & everyone,
Thanks for raising this issues in this Community.
We would like to inform you that the unavailability of Services & Subscription for Microsoft accounts is a known issue. The main symptom is that users encounter an error when visiting the Services & Subscriptions page and are unable to install Microsoft and Office. This issue is currently being addressed. It does not affect all accounts, and some users can access the page after refreshing, logging out, or switching network environments.
Alternatively, you may try bypassing the account workflow to avoid the login issue (Solution below from Wolfram74)
Additionally, for customers needing to cancel their Microsoft 365 subscription or request a refund, Microsoft offers online Chat services and Phone Support. Everyone can manage refunds and subscriptions by referring to the following articles.
If convenient , kindly provide the current Services & Subscription TraceID to Chat support, allowing them to submit requests based on the TraceID and investigate the issue using the specific account.
This thread will be updated as soon as there are any fixes, thanks!
Best regards,
Chandy.L | Microsoft Community Support Specialist