On iOS, Rush is not upgraded even though my subscription is active.

I'm sorry to hear that. It sucks. Have you tried logging in to your adobe account on other devices? Im not sure how you were able to use Premium for a day and then not, so that could be an error outside your control. 

But hopefully if it isn't, you might want to note that this might have happened if you use two different emails for your

1) Adobe Account email

2) Subscribing Account email

The email shown on your subscription order bill/notification isn't neccessarily the same email used for your Adobe account, so if you have multiple Adobe accounts with different emails, maybe you might want to check you are logged into the correct** Adobe account that you're actually paying for.

**If you use email A for your Adobe id, but subscribe to Premium on the App store under email B, the bill files everything under email B. email A is mentioned nowhere on the bill or subscription info, even though the Adobe premium account being paid for is under email A. And email A gets no notification from Adobe on its upgrade. In this case, email A is the right one to use for premium.

Maybe Adobe can do something abt the info shown on subscription bills and make reference to the Adobe account and not just the App store account the subscription was made from because it can get quite confusing. 

All the best for your projects. Hope you were able to resolve it! Anyone else with this problem?