I'm new to the game so first time I've participated in this event. It was working fine but then suddenly I stopped earning maze coins when I cleared food or coins or fed dragons. I even blew some gems to hatch an egg to see if I got any maze coins. Nope. I have no idea how many I've earned but not gotten and not happy about losing ground in this short event. Is this just happening to me or is it a known game-wide issue? I've rebooted a couple of times, didn't make any difference.

Forgot to mention...when I do an activity that "should" earn maze coins, the event button on the righthand side on the page where all the options are flickers as if something is being added...but it doesn't add anything.

Found my own answer on a post from a year ago. Player was having the same problem and got this response:
Have you already collected the maximum for the time period? The maximum to collect is 600 coins per 8 hour collection periods. Your collection period will depend on your time zone. You were given 300 initially so you should have a maximum of 900 at this point, unless of course you received some in the mobile video rewards. .....That said, it would be nice if that info was included in the event info so we know to expect that and not think it's a problem. I'll leave this post in case someone else needs to know this.

@Debbie-Lapeyrouse Yes. We have timewindows to collect event coins. I do not know how many coins you can collect in your event because new players get special ones. But you can see collection times here: Collection times:
Open the eventwindow. In the upper right corner besides the event name you see the timer .
This timer started with ....days,23hours,59minutes (on phone it doesnt show minutes).
It will count down to 00d 00h 00m.
You have three timewindows of 8 hours every day to collect 800 eventpoints (coins).
Ignore the days , just check hours and minutes of the timer.
These are the timewindos to collect the coins:
23h59m-16h00m.
15h59m-08h00m.
07h-59m-00h00m
So you have 8 hours to collect the full amount of points. After that time a new timewindow will start and you start collection for the next 800 points. So it is possible to get ready with collecting 800 points ten minutes before the window ends and then after 10 minutes collect again 800 points because the next timewindow started. Just bring the time the timer shows in relation to the time your clock shows and you find the times for your timezone. I hope this is helpful.