How to get ID from current logged in user to thymeleaf and use it in link th:ref

Question

im trying to acess my authenticated users details, and show a custom control panel with all details regarding that user, the problem im facing is passing an Id to the thymleaf th:href with something similiar to this e.g:

href="@{/updateUser/{id}(id=${getUserById})}">Attend

Iv tried several methods to acess the userDetails, which iv made work, i can now for example through my "UserDetails" acess certain methods as fullname, age .. and anything from my entity. Even the id, which i can print out through thymeleaf to my home screen, but what im really trying here is to acess the id, passe it to thymeleaf th:href link so everytime any account is logged in (i have user, and employee) it can use that id and know which user to get to.

Controller:

@GetMapping("/account")
public String viewUserAccountForm(
        @AuthenticationPrincipal CustomUserDetails userDetails,
        Model model) {
    model.addAttribute("user", userDetails.getIdFromUser());
    return "layout";
}

User Details public class CustomUserDetails implements UserDetails { private User user;

public CustomUserDetails(User user) {
    this.user = user;
}

//Vänta på Roles implementering i User.
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
    Set<Role> roles = user.getRoles();

    List<SimpleGrantedAuthority> authorities = new ArrayList<>();

    for (Role role : roles){
        authorities.add(new SimpleGrantedAuthority(role.getName()));
    }
    return authorities;
}

@Override
public String getPassword() {
    return user.getPassword();
}

@Override
public String getUsername() {
    return user.getEmail();
}

@Override
public boolean isAccountNonExpired() {
    return true;
}

@Override
public boolean isAccountNonLocked() {
    return true;
}

@Override
public boolean isCredentialsNonExpired() {
    return true;
}

@Override
public boolean isEnabled() {
    return true;
}
public String getFullName(){
    return user.getName();
}
public Integer getIdFromUser(){
    return user.getId();
}

}

**Layout / Header **

<div class="nav-item" th:switch="${#authentication}? ${#authorization.expression('isAuthenticated()')} : ${false}">
    <div th:case="${false}">
        <a th:href="@{/signIn}">
            <button class="loginButton">Sign in</button>
        </a>
    </div>
    <div th:case="${true}">
        <ul class="navbar-nav">
            <li>
                <img class="nav-link dropdown-toggle" href="#" id="navbarDropdown2" role="button"
                     data-bs-toggle="dropdown"
                     aria-haspopup="true" aria-expanded="false" th:src="@{/images/online.png}"/>

                <div class="dropdown-menu" id="d1" aria-labelledby="navbarDropdown2">

                    <a class="dropdown-item" href="#">My Account</a>
                    <a class="dropdown-item" th:href="@{/logout}">Logout</a>
                    <a class="dropdown-item" th:href="@{/updateCustomer/{id}}">Logout</a>
                    <a class="dropdown-item" th:each="user : ${user}" th:href="@{/userList/{id}(id=${getUserById})}">Attend</a>
                </div>
            </li>
        </ul>
    </div>
</div>