Will my EU vaccination certificate with 1 shot be accepted for the Thailand Pass application?

When you get your code it will be in PFD format. You will have to convert this to a JPG format before you upload it. A lot of people are not aware of this.

My situation is the same, recently recovered and have had a single dose of Pfizer. The UK NHS app shows that I have tested positive and provides a certificate with QR code for this, and also an additional certificate for the one vaccine dose I have received again with a QR code. I am not ready to start my Thailand Pass application so cannot verify if the two certificates I have are acceptable for the Test and Go scheme. Be interested to hear how you get on.

I have a call booked with my GP this coming Tuesday to request their approval and an appointment to receive a second dose of Pfizer 3 weeks after my first dose for urgent overseas travel. Normal wait time for the second dose is 8 to 12 weeks, but your doctor can book it earlier for you. I've not been advised that you cannot receive a second dose if previously infected. Will update you with the outcome.