You cannot send Apple Cash directly to Cash App
Transfer Apple Cash to your bank account first
Open Wallet on your iPhone
Tap your Apple Cash card
Tap Transfer to Bank
Choose Instant Transfer or 1–3 Business Days
Enter the transfer amount
Confirm with Face ID, Touch ID, or passcode
Open Cash App
Tap the profile icon or Banking tab
Add the same bank account or debit card you used for the Apple Cash transfer
Add money to Cash App from that bank account or debit card
If needed, use the Cash App debit card to spend the funds after transfer completes