👋
I was following your Dapp University tutorial.
Your actual example is correct (the one in this repo and part of it on the tutorial), but the step-by-step examples have a small mistake:

The first line should read:
const address = "0x90e63c3d53E0Ea496845b7a03ec7548B70014A91"
not:
const account = "0x90e63c3d53E0Ea496845b7a03ec7548B70014A91"