Unable to inject JS to 'click' button using getElementsByClassname via WKWebView

Problem: Can't get code to 'click' button to execute action

Context: I'm able to get the element and change it from disabled to visible so I know I have the button class name correct in the command prior to this one but for whatever reason when the code gets to this switch case nothing happens; and no error is provided in the xcode console. There is no button input id and no form name associated either.

Question: Since I'm certain I have the getElementsByClassName....click() part correct, and I know this is the only element on the page with this name is there another way to execute the 'click'

Website HTML code:. [Last few lines of code]

<div class="mr-0 mr-md-5 pr-md-4 mb-4">
   <p class="mb-1 body-s" role="" aria-live="">Password</p>
   <span class="aria-hidden-logic d-none" aria-hidden="false">
      <label class="body-xs font-weight-bold mt-lg-2 mt-xl-2" for="oldPassword"></label>. 
   </span>
   <div class="input-controller aria-hidden-logic mb-2" aria-hidden="false">
      <input class="form-control is-invalid" type="password" id="oldPassword" placeholder="Old password" maxlength="40" aria-describedby="error-oldPassword" aria-label="oldPassword" value="">
      <button class="body-xs show-hide-btn" aria-label="Show Current Password">Show</button>
   <div aria-live="polite">
      <div class="error-class" id="error-oldPassword">Please enter your password</div>. 
      </div>
   </div>
   <span class="aria-hidden-logic d-none" aria-hidden="false">
      <label class="body-xs font-weight-bold mt-lg-2 mt-xl-2" for="newPassword"></label>. 
   </span>
   <div class="input-controller aria-hidden-logic mb-2" aria-hidden="false">
      <input class="form-control " type="password" id="newPassword" placeholder="New password" maxlength="40" aria-describedby="error-newPassword" aria-label="newPassword" value="">
      <button class="body-xs show-hide-btn" aria-label="Show New Password">Show</button>. 
      <div aria-live="polite"></div>
   <span>
   <ul class="ul-list-helpText">
      <li class="">Password must be 8-40 characters long.</li>
      <li class="">Your new password cannot be the same as your old password.</li>
      </ul>
   </span>
   </div>
   <div class="d-flex justify-content-end">
       <button type="button" class="btn btn-link body-s h-auto my-2 mr-3">Cancel</button>.   
       <button type="button" class="btn btn-secondary core-btn uca-button btn btn-sm btn-primary">Save</button>
   </div>
</div>

Swift Code [Doesn't work to click Save button]

 webView.evaluateJavaScript("document.getElementsByClassName('btn btn-secondary core-btn uca-button btn btn-sm btn-primary')[0].click();"){
                (result, error) -> Void in
       
                print(error)
           
            }

Swift Code [Works to enable Save button - when it's originally disabled]

            webView.evaluateJavaScript("document.getElementsByClassName('btn btn-secondary core-btn uca-button btn btn-sm btn-primary')[0].disabled = false;"){
            (result, error) -> Void in
            print(result)
            print(error)
        }