amazing, always when you think Thai Immigration can not surprise you anymore they pull one out. Actually great to open so early, should be allover the country.....
the cacellation must be done by Immigration , if done you can go to other places to apply. As other member already mentioned in Vientiane need booking 3-4weeks in advance. You can do also a quick border run for 30dasy and do a 30day extension.
most likely no, because you already registered your passport. I look often into the system and sometimes I get that message too, I log on a few minutes later and it is fine. You can also request a new password.
they have upgraded, redone and fine tuned that system, most likely during process they detected your account being idle and blocked it. Best send them a message, or you try to log on again in few minutes.
I have never seen a Vietnamese with a METV, but it is possible. If teh person plan to do visa runs for 30days, please be aware that Vietnamese are not unlimited anymore, just TWICE in a calendar year and for visa application the Vietnamese have to return to home country.
just had a look and the online appointment system is open for booking up to Friday 31st May. I assume that tomorrow or within a few days they will release the first week for June to the public.