Welcome to the forum @Kibrom_Mahari! When you have a chance, we encourage you to introduce yourself and your project to help build community and add context around your needs. It also looks like you may have created a second account - @kibrom.mahari!?
Have you set up a fully qualified domain name as described at https://docs.getodk.org/central-install-digital-ocean/#getting-a-web-address-domain-name ?