I don't understand This AWS gateway or firewall domain request!

An "allow-list" or "firewall domain allow-list" refers to configuring your network firewall or web application firewall to allow access from approved IP addresses, domains or address ranges.

Check on the following:

• AWS provides network firewall capabilities through services like AWS Network Firewall and web application firewall through AWS WAF.
• These firewalls need to be configured to allow access for your applications from specific trusted sources only. This is done by creating "allow lists" or "allow rules".
• For AWS Network Firewall, you can create allow lists with IP addresses/ranges or domain names that will be allowed to access resources protected by the firewall.
• For AWS WAF, you can configure allow rules to define which IP addresses/ranges are permitted to access your applications, APIs or web resources.
• AWS Firewall Manager allows you to centrally manage these firewall configurations across multiple AWS accounts for consistency.