The IRS will send the deposit to the routing number and account number that you entered. The IRS does not check the name on the account, but the bank that receives the deposit might check the name.
Cash App is not a bank. This is very clearly stated on the Cash App web site. The Cash App banking services are provided by a third-party bank that Cash App partners with. It's up to the bank whether or not to accept the deposit that the IRS sends. As Critter-3 said, if the bank rejects the deposit the IRS will mail a check to the address you entered on your tax return.
At this point there is nothing you can do but wait and see what happens. It doesn't matter what you or Critter-3 or anyone else thinks.
