Dear customer, to fix all these errors, you need to verify your ownership for the domain you want to publish the application for, google provides you a file that you need to upload on your server in order to google be able to verify the ownership, you can get more support on the same on your ticket on the support center.

Dear Customer, Please refer to our documentation for the step by step guide to do the same
https://websitetoapk.com/docs/creating-keystore-for-signing.html