This means another account logged in from the same network as you did. Common triggers include logging in from a corporate/school network or using a VPS. Krydos can probably provide extra clarification if you'd like. I'll cancel the pending suspension for your account in the meantime.
Domain name changed to worksyncpro.helioho.st. Also, if you want to still add worksync.helioho.st, a staff member can set that as an addon domain for you.
We traditionally don't whitelist certain IPs, so if you have a service connecting over FTP from an Azure server, as long as it uses the correct credentials, it shouldn't get blocked.
This is something an administrator can do, but mail quotas are changed on a case by case basis. I'll escalate your thread so an administrator can comment.