Thai E-visa site says they have requested document but I haven’t received an email with what they require. (London embassy) Does it normally take a while for the email to come in?

Morning All.

My status on my visa application as changed from saying paid to saying request document. As this happened to anyone ? And if so and they require more documentation, how do you find out what is required. I have emailed the embassy to ask the question, just wondered if this happened to anyone so i can get it sorted. Cheers in advance.