I guess there should be a washing/equilibrating step (buffer) and an elution step (buffer). I have tried direct elution with warm TE with limited success.
I am working with saliva, stabilized in the DANAGen saliva collection kit and I am plannimg to use DANAGen saliva RNA kit
https://www.danagen.es/wp-content/uploads/2019/06/DANAGENE-SALIVA-RNA-ingles-KIT.pdf
Try eluting multiple times with smaller volume of buffer. Use warm TE and increase incubation time.
you can try to use 95 degree pre warmed TE buffer. It might work better than just a bit warmed buffer. But before it you need to wash it with wash buffer to eliminate many other conteminants. In addition if that method doesnt help you can add 0.3 M NaCl in your elution buffer. that will disassociate DNA from column.
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