Is it on a cloud hosting service, or is there multiple web servers behind a NAT/load balancer? If so, your IP may be different when you login again.
With your license key, I can check what the IP/domain/server path are, then you can re-issue and we can see if it changes or stays the same.
Another possibility is if you have an IPv4 and IPv6 address, we may need to add the second one manually.