Apply for production : Sorry the service is temporarily unavailable

Have you tried again today? Have you been contacted via the support team?

Looks like the format of icon submitted was the culprit. I converted the icon from jpg to png and it was accepted. They should really provide the real reason why the submission gets refused. Lost almost a week because of that. All that time, I was thinking the submission service was the error.

Thanks for sharing the solution! Let me replicate the issue myself and report it to the team.