IPv4 Only provisioning was exclusive to former UPC areas and is no longer available.
As of June 2022, the fZiggo and fUPC provisioning backends are consolidated and Full Dual-Stack is available to all customers. Remaining modems with IPv4 Only and Dual-Stack Lite eRouter configurations are gradually being migrated to FDS. Modems newly installed after June 2022 obtain this configuration by default.
Please describe the problem you are encountering, if applicable.
Dual-Stack Lite (CGNAT, 213.127.0.0/17) can be converted to Full Dual-Stack on request, as mentioned by Bert. You may use this site to look up your public IPv4 address.