It took me a long time to pinpoint the problem and meanwhile did try to register another domain without success. Initially I thought there was a PHP 8.09 upgrade problem because other sites were affected. Also thought MySQL upgrade was causing problems. Eventually checked propagation and noticed the domain is no longer valid.
The domain expiry date had quite a few months before expiry.
I’ve been using their services since 2017 and recommended them whenever possible and also purchased a couple of “.com” TLDs. It is infuriating that all the “.tk” domains were withdrawn overnight without notice. I still have a “.ga” but will move the contents along with all the others to sub domains… no easy task