Thai Pass rules change like the weather. On
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when I arrived in Phuket I had to have prearrange prepaid RT-PCR Test and SHA-Plus Hotel reservation for the 1st night which you were ushered off by the taxi right after swab. The hotel will be emailed your result so you know when you are free to roam. Google Thai Pass and it gives the list of eveything you need to do. Have it all in a folder because every airport enroute will ask you for all requirements "when" they see your destination is Thailand.