If when you pull down the pan, it has a gasket then you don't need sealant. It is leaking because it basically has a failed seal so no matter how tight you make, it still have the path. If there is no gasket then you use a sealant silicone rated for transmission fluid.
Sounds like you just need to pull it down and reseal it. I attached the process which does not have a lot detail but it does give the steps.
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Monday, April 6th, 2020 AT 2:53 PM