Network user unable to log

I've just set up a new Macbook Pro but am having problems logging in as a network user. This is the first time I've done this with Monterey but didn't expect it to be any different than earlier macOS versions. There are older Macs connecting with no problems but I must admit it's a while since they were set up so I can't be 100% sure I've not missed something.

In the Login Options of Users & Groups, the Network Account Server displays correctly with a green "light".

In Directory Utility - Directory Editor, I can view LDAP users after selecting that server in the "node" dropdown and selecting any user in the list displays the values I'd expect in the righ-hand pane.

From the login screen if I enter a network user account and deliberately enter the wrong password, the spinner appears for a second or two and then the password field shakes before returning to the login screen which is just as I would expect.

However, if I enter the correct password, the credentials fields disappear (as expected) and the spinner continues ... apparently indefinitely. I've left it trying for nearly 30 minutes and it does not finish or timeout. A forced power down seems to be the only way to stop it.

Does anyone know what might be causing this and how to go about fixing it?