community edition site temporarily unavailable due to maintainence

Hi All. I'm new to appian environment and started learing 3weeks ago.

At first I can access my community edition environment and do my hands-on exercises.

But yesterday night, I can't access my appian community edition environment suddenly when I was doing my exercises and it keep showing the screen "This site is temporarily unavailable due to maintenance." till now.

I've already sent an email to "CommunityEdition@appian.com" but I don't know when will they reply.

Can anyone please help me out?

Thank you in advance.

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