Transfer to server Unavailable

Apologies if this was posted in the wrong place but I am new to forums.

A friend of mine is trying to tranfer to this server but is greeted with this:

The Home World Transfer service is currently unavailable, or the website is undergoing maintenance.
Please wait and try again.

Does that mean there is mentainance or there might be something he is doing wrong?

With Endwalker in early access, the servers are all overloaded. I would assume that's why.

Check the lodestone for the Server status page:

It will tell you if the world you seek is available for transfer or if it is full or unable to create new characters.
It is updated regularly so refresh.