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Tint shouldn't cause problems - comfort access has sensors inside the car & out - in normal operation if you have the key inside the car and press the lock button on the door, the car won't lock. Also, if you throw the key in the boot it'll let you unlock and open the boot, but won't let you start the car.
So, it could be half your sensors don't work. I'd start by changing the battery in both keys, then testing one key at a time to check it allows you to lock/unlock and start. I trust they work with proximity when you open the doors, not just when you press the lock/unlock button?
I had one key work properly and one key only work with buttons & insert (no proximity/comfort access) and had to pay BMW to delete all keys and re-associate the two keys to fix. They said only the first two keys associated with the BMW will work with comfort access proximity. All other keys operate like normal keys.
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