Hello Vikral,
Thank you for reaching out and thanks for using Cloud WordPress. I tried accessing your current cloud installation https://demo2.cloudwp.dev/trial-z2t42y52/wp-admin/ from both the front end and user dashboard and I didn’t have any issues. I’m thinking the server was just overcrowded when you attempted accessing your site right after your initial installation. We have over 75,000 cloud instances at a time and sometimes you’ll see that error message when the server gets backed up but it normally only last a few minutes.
I hope this helps. Please reach back out if you have any other questions for us.