Why is Kraken not letting me buy?

Why is it that Kraken, the seemingly reputable cryptocurrency exchange, is preventing me from purchasing? I have been a loyal user for quite some time, but suddenly, I'm facing restrictions. Could it be due to some recent updates or changes in their policies? Or is it a technical glitch that needs to be addressed? I've checked my account balance and it's sufficient for the purchase, so what could be the issue? Is there a specific reason why Kraken is denying me this transaction? I'm really puzzled and eager to understand the reasons behind this unexpected blockage.