This is not a recognized subdomain (configure-linux.sh)

Hi guys,
we are using the `configure-linux.sh` script since years but since yesterday we got the following error while execution: 
```
INFO: Checking if 'xxx' subdomain is valid.
ERROR: This is not a recognized subdomain. Please ask the account owner for the subdomain they signed up with.
```
We didn't change anything from our side.

Could you please assist us?