It never tints because the very first time it runs, you turn on self switch A, which activates page 2, which does nothing.
You only use a self switch and a second page for a parallel process if you want to do something once only, and never again.
You use erase event for a parallel process if you want it to run some commands as soon as the map is loaded, and not again until the next time it loads.
Because yours is something you want to run continually, you should not use a self switch OR erase event. Your switch and conditional branch are also unnecessary. What's the point of saying "cycle = ON" followed immediately by a condition to say "if cycle is ON"? Of course it's going to be on, because you just turned it on.
The other thing you need to consider is, because this is a map event, it's only going to run on this one map. As soon as you move to another map, it's going to stop running. When you return to this map, it's going to start over, with the original tint. So you could have bright daylight, dusk, midnight, then walk into a building and out again, and suddenly it'll be bright daylight again because it started over at the beginning. If you want this to run between maps and not lose track of where it was, you need to use a common event rather than a map event. THEN you will need to make a map event to turn on the switch, and condition the common event by that switch (because parallel common events can only be run when a switch is on) - don't use a Conditional Branch event command.
