I see that there is a notice on the main bricklink page this morning saying that there has been a cyber incident with one of its partners. Certain transactions are not currently possible, namely all non-EU to EU sales and non-UK to UK. Intra-EU are not mentioned as impacted. Given the nature of the transactions it might be tax related.
[Edit: they advise that an update will be shared as soon as possible and no later than the 16th March ... not a fix in an hour then]