Update 18.3 Online booking system Royal Thai Embassy. Do not know what to tell, the system works as designed... If you have a problem with your booking please contact support@thaivisavientiane.com , mail account is now working. I also have noted that slots for the 9th, 10th , 11th and 12th April are available. However I noted that every 1-2 minutes one slot is taken. For the 9th, at 14:00 still 108 slots free, now at 17:06 all slots are taken. I guess, whoever manipulate the system will continue now with the 10th and 11th of April.
TLDR : Answer Summary
The online booking system for the Royal Thai Embassy appears to function as intended, with available slots for visa appointments on specific dates like April 9th-12th. However, it's crucial to act quickly, as slots can fill up rapidly, sometimes within minutes. If users encounter any problems with their bookings, they are advised to reach out to the support email provided.