Login issues with a newly purchased domain

About a month or two ago, I directed my client to purchase a domain from cloudflare, and now I realize it was a bad idea because he cannot find any documentation about his account. Because it had been inactive for over a month, it was deleted.

I’m wondering if it’s enough to have a receipt for the domain to ask cloudflare to let us know which account of his might be the one that he purchased the domain with. However, each time I try to ask about it on their helpline, it tells me that I cannot ask about that domain because I’m not the owner of the domain.

How do I go about getting access back? Also, this client has difficulty using the interface, and would prefer that I myself access it for him. This also seems to be against their policy.

Thank you for reading this and for your support!