Have the rules changed around the TM47 online application recently?
Just got rejected with
“For first-time requests of a 90-day notification in each country visit, in-person presentation at the immigration office is required.”
For the last few years I’ve always been able to submit online even on the first notification.
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EDIT: For the record, I had my landlord update my TM30 online, then re-applied for TM47 online. Same error. So for now it seems you definitly have to go in-person for first notification, at least in Bangkok.