The thermal image EXIF format obtained from the H20T camera is not the same as the other thermal images rjpeg format which is why Pix4Dmapper is not able to use the FLIR SDK for conversion to tiff and use them to produce thermal maps with temperature values. For Zenmuse H20T, you can only generate thermal maps for visualization.
This means, for the thermal images, you can still process them as RGB images (not a grayscale one with temperature values). You can use it for visualization and by looking at the colors on the map and the color scale, you will be able to detect anomalies but will not be able to get the temperature value of that particular object/pixel.
For more information visit, Pix4Dmapper not converting RJPEG images to tiff from Zenmuse H20T and Mavic 2 dual enterprise advanced thermal camera