Unable to Sign up for rising tension: golgari swarm

When I press the 20 coins to buy into the event the error message appears and 20 coins is deducted from my account and the 20 coin buy in button remains lit and active. Signed up 4 times. Rebooted my phone and app twice for two of them. A hard reboot fixed the issue but it cost me 80 coins to get into the event. A ticket was submitted. This is not the first time this specific event (other rising tension events work fine) has done this. I didn't complain then but I should have. After this many coins being deducted I had to say something so you're aware