Can't get Guest Checkout to Work in VM4

[smusselm]

I used the following code on my cart default template override in VM3 to accomplish guest checkout along with a note that shipping won't be calculated without entering an address.

Code Select Expand

//CUSTOMIZATION - Display Buttons if not Logged In
    if($userID ==0 && empty($this->cart->BTaddress['fields']['email']['value'])){?><div class="tocheckout">To Checkout</div><a href="#" class="button cart-login">Sign In</a> <a href="<?php echo JRoute::_ ('index.php?option=com_virtuemart&view=user', $this->useXHTML, $this->useSSL) ?>" rel="nofollow" class="button cart-register">Register</a> <a href="<?php echo JRoute::_ ('index.php?option=com_virtuemart&view=user&task=editaddresscart&addrtype=BT', $this->useXHTML, $this->useSSL) ?>" rel="nofollow" class="button cart-guest">Continue as Guest</a><?php } 
    if($userID ==0 && !empty($this->cart->BTaddress['fields']['email']['value'])){?><div class="tocheckout">You are currently checking out as a guest. If you'd like to create an online account </div><a href="<?php echo JRoute::_ ('index.php?option=com_virtuemart&view=user&task=editaddresscart&addrtype=BT', $this->useXHTML, $this->useSSL) ?>" rel="nofollow" class="button cart-register">Register</a></a><?php } //print_r($this->cart->BT);

The issue is that with the J4 router, I can't get the Guest checkout page to appear.  It goes to /vm-account/user/editaddresscartbt.html, which displays some sort of account page, but without a guest checkout button. However, if I turn off SEF URLs across the entire site, everything works perfectly, which isn't an option.

The non-sef URL that works: /index.php?option=com_virtuemart&view=user&task=editaddresscart&addrtype=BT&Itemid=1701

What am I missing? I don't need this particular URL to be an SEF URL, I just need guest checkout to work. Even if I hardcode the itemid in the URL, it still doesn't work.

Thanks!