Losing access to domain control.
THE SITUATIONS
Forgotten credentials with an unreachable contact address A registrar account in a former employee's or developer's name A registrar that has become unresponsive An account locked
WHY IT IS SERIOUS
Without registrar access you cannot change nameservers, renew the domain, or transfer it.
That is more limiting than losing hosting access.
WHAT YOU CAN STILL DO
If you have access to the DNS provider the nameservers point at, you can change records.
That covers most operational needs short of a nameserver change or a renewal.
RECOVERING ACCESS
Most registrars have a recovery process requiring proof of identity or of entitlement.
Expect it to take time, deliberately.
IF THE DOMAIN IS IN SOMEONE ELSE'S NAME
The registrant is who the registrar deals with. Demonstrating entitlement as the business requires evidence.
Start early rather than when renewal approaches.
THE RENEWAL RISK
A domain you cannot renew will expire. That is the urgent part.
PREVENTING THIS
Domains registered in the business's name, with a contact address on a different domain, and more than one person with access.