Both "in" and "on" are fine (https://forum.wordreference.com/threads/in-or-on-your-bank-account.323790/).
Spot on, to the point, and prompt as usual, devalanteriel. Where would we be without you? I would add to Ashley in all due respect that, despite your Anglo moniker, "monies" is quite rare in English, except in specialized fields like economics, finance, etc. No one I know (born and raised in the USA) would say "no monies left in the account". Even in the case of multi-currency accounts.