Custom domain already in use but not attached to any of my accounts

Hello,

I purchased the domain zero4host.online from Hostinger and added it to InfinityFree. I have checked all of my email accounts and I cannot find any other InfinityFree account that contains this domain.

Since I am the owner of the domain, could you please help me verify ownership and remove the domain from the old account so I can add it to my current account?

I can provide proof of ownership from my Hostinger account if needed.

Thank you.