Update:
I created a second Viveport account, with a different e-mail address. Before setting it up, I cleared my browser's history, including cookies.
The same issue happened again: My profile location was set to US. I made sure to set up the store location to US also (took a screenshot).
When I went to purchase an Infinity yearly subscription, the store location was again UAE. Frustrating, to say the least.
I hope your CS team will be able to get back to me in a timely manner AND, as importantly, extend the promotional price + free games I would have received if not for the issue