I have already heard both

Thank you so much


Thank you very much

Is it OK to use:

Thank you so very much


Whether it is correct may be less important than if it's being used. And it is.

Just consider it as another attempt to add emphasis:

Thank you
Thank you very much
Thank you so much
Thank you so very much

It could be a bit 'overdone', but that depends on culture, e.g. Americans tend to use more emphasis in these 'social phrases' than English speaking Europeans.

  • 2
    I would add that if it's a personal interaction then, "Thank you so much" conveys a much more heartfelt response. – Alan Oct 7 '19 at 15:04

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