Given what youāve already tried, I doubt thereās much else you can do except wait to hear from support - they do not monitor or participate in these forums.
Welcome to the forum.
Something odd that I have noticed over the years is that the browser I am using influences my Glowforge account. Just this minute I clicked on āmanage my subscriptionsā while in Firefox, and nothing happened. Clicking on the same tab in Chrome takes me to a page that shows my Premium price and other details. Try upgrading to Premium while using a different browser.
It could be something about your home network setup maybe? If your phone was on wifi at the time that would still be on your network. Might be worth trying it on the cell network by turning off wifi and see what happens.
If you have some whole house firewall rule or something like a pi-hole or other proxy it could maybe impact this. To be clear: this is a very longshot, but may be worth chasing down just to be thorough.
When I click on the upgrade option in Chrome (my default browser), Firefox or Safari, it takes me to a series of dialogs to enter personal and credit-card information.
I think there is a deeper level. One for using your Glowforge and another for where money is needed. If you try to go to the catalog it might get you to that point. And all the things you can spend money on are there, including buying a glowforge.
There is no specific URL, I am just clicking the āGo Premiumā button at the top of the dashboard or within the GF UI itself - same result, brings up the dialog I posted, which is the first of several.