Beware that if you’re using Revolut Mastercard instead of Revolut Visa, transactions will be initially authorized in USD and only at the settlement date will be processed at the original MAD amount. This means that they will not be taken from your MAD wallet.
If you have Mastercard, I strongly recommend that you temporary disable all other wallets (and empty your main account wallet), and only keep money in your MAD wallet. This way , although transactions will initially show as USD, they will be settled at the right MAD amount a few days later. This doesn’t apply to ATM transactions as they will be authorized and processed in MAD.
If you have Revolut’s Visa card then all transaction will be directly authorized and taken from your MAD account.
Read through this Morocco end up using my EUR account and not my MAD for more details.