Laravel Delete request - MethodNotAllowed

I'm creating the delete functionality for a "speaker" in my system. I keep getting the below error:

MethodNotAllowedHttpException in RouteCollection.php line 233:
in RouteCollection.php line 233
at RouteCollection->methodNotAllowed(array('GET', 'HEAD', 'PUT', 'PATCH', 'DELETE')) in RouteCollection.php line 220
at RouteCollection->getRouteForMethods(object(Request), array('GET', 'HEAD', 'PUT', 'PATCH', 'DELETE')) in RouteCollection.php line 158
at RouteCollection->match(object(Request)) in Router.php line 533

My routes (shown below) indicate that I can delete a speaker, so I'm setting up my form HTML like:

@foreach($speakers as $speaker)
    <form action="/admin/speakers/" method='POST' id="delete-speaker-">
        
        
        <tr>
            <td> </td>
            <td class="text-center">
                <a onclick="event.preventDefault();console.log('here');document.getElementById('delete-speaker-').submit();"
                   id='delete-' class="btn btn-danger btn-sm">
                    Delete
                </a>
            </td>
        </tr>
    </form>
@endforeach

Based on what I've seen on various forum posts this should work. I'm baffled because I must not be seeing some small detail that I've messed up. It looks like everything is correct. When I see the MethodNotAllowed I can refresh the page without the typical "Are you sure you want to re-submit this form" which I find odd. That's probably a hint at the problem but I'm not sure what next step I should take to try to resolve this.

Here's my route list:

+--------+-----------+-------------------------------+------------------+------------------------------------------------------------------------+--------------+
| Domain | Method    | URI                           | Name             | Action                                                                 | Middleware   |
+--------+-----------+-------------------------------+------------------+------------------------------------------------------------------------+--------------+
|        | GET|HEAD  | /                             |                  | Closure                                                                | web          |
|        | GET|HEAD  | admin/dashboard               |                  | App\Http\Controllers\Admin\DashboardController@index                   | web,auth     |
|        | GET|HEAD  | admin/speakers                | speakers.index   | App\Http\Controllers\Admin\SpeakersController@index                    | web,auth     |
|        | POST      | admin/speakers                | speakers.store   | App\Http\Controllers\Admin\SpeakersController@store                    | web,auth     |
|        | GET|HEAD  | admin/speakers/create         | speakers.create  | App\Http\Controllers\Admin\SpeakersController@create                   | web,auth     |
|        | DELETE    | admin/speakers/{speaker}      | speakers.destroy | App\Http\Controllers\Admin\SpeakersController@destroy                  | web,auth     |
|        | PUT|PATCH | admin/speakers/{speaker}      | speakers.update  | App\Http\Controllers\Admin\SpeakersController@update                   | web,auth     |
|        | GET|HEAD  | admin/speakers/{speaker}      | speakers.show    | App\Http\Controllers\Admin\SpeakersController@show                     | web,auth     |
|        | GET|HEAD  | admin/speakers/{speaker}/edit | speakers.edit    | App\Http\Controllers\Admin\SpeakersController@edit                     | web,auth     |

via Webnet