Can't connect my "alternative id" account to my Visual Studio credits

Question

My team has new members trying to connect their personal accounts to their Visual Studio subscription credits using a process we've documented and used without issue for some time. However, the instructions don't work anymore.

Once their subscription is active on their work account, they:

1. Add a personal microsoft account as an "alternative id"
2. Log into Azure with their personal account
3. Go to subscriptions and click "ADD"

And that's where things break down. There's supposed be an "All other offers" drop down area, but there isn't. Only the "Free Trial" and "Pay-as-you-go" options.

Meanwhile, I used the same instructions as they did (though I did it more than half a year ago) and it worked fine. Even now when I look at the add subscriptions page, I can see "All other offers" with a down arrow showing there are many other options there. But our new employees are stuck. What gives?