Q-assign connects to your Salesforce org from a single static outbound IP. This article confirms the current IP, whether any additional ranges are required, and how to whitelist it in Salesforce.
1. Go to Setup → Security → Network Access.
Click New under Trusted IP Ranges.
Enter Start IP = 169.150.239.176 and End IP = 169.150.239.176 (single address).
Save.
2. If you use Profile-level Login IP Ranges:
4. Confirm Q-assign sessions are not being blocked and that login flows/errors no longer reference disallowed IPs.