I believe that mileage upgrades and EUA upgrade both come out of the R bucket at the moment. It's hard to keep track since CO does at times use different buckets depending on how you upgrade.

But even if it's available doesn't mean you should have it. If it's available means it will be allocated at the next EUA sweep, which could be whenever. Unlike United, where there's a waitlist for upgrade space and upgrades clear whenever there's space, CO's EUA upgrades are a function of the ancillary sweep process that happens when it happens.

Good luck!