Yet Another Round of "Why is my route not defined?!"

There are SO MANY "Route not defined" threads, but I swear I've tried everything I can think of and that people have said, so I'm thinking I'm doing something stupid that I'm missing, lol.

Laravel 10.44

ERROR MESSAGE:

Symfony\Component\Routing\Exception\RouteNotFoundException: Route [account.membership.claiming-no-user] not defined. in /var/www/html/Xerocraft/vendor/laravel/framework/src/Illuminate/Routing/UrlGenerator.php:477

In my email blade template I have a component that references a route with this: \resources\views\emails\membershipPurchasedForOther:

@component('mail::button', ['url' => route('account.membership.claiming-no-user', [$membership->activation_code])])
    Activate Membership
@endcomponent

This is called from a queued Illuminate\Mail\Mailable, which is called from an event Listener.

The route is listed in web.php:

Route::group(['prefix' => 'account', 'as' => 'account.'], function() {
   Route::get('/claim/claim-membership/{code?}', 'Account\AccountMembershipController@claimShow')->name('membership.claiming-no-user');
});

IMPORTANT NOTES:

• This is a new route! However this route DOES show up correctly when used in other places other than within this queuable mailable's view
• There ARE other routes called in that view template and they're all working (including within other @components of the same type using the 'url' parameter in the same way)

THINGS I'VE TRIED:

• Changing the url to something that would ABSOLUTELY be uniquely matched, just in case it was interfering with another route
• Removing the url parameter completely from the route and controller and the view
• php artisan cache:clear & php artisan route:clear
• php artisan optimize
• composer dump-autoload
• swapping the route with a different one within the view and it then works correctly
• Checking to make sure the route works in other locations (such as dumping it via DD inside of a random controller, just to make sure the route works in general).
• Checking php artisan route:list. It shows the route with the correct controller and the correct method (GET):

 GET|HEAD        [home url here]/account/claim/claim-membership/{code?} ............ account.membership.claiming-no-user › Account\AccountMembershipController@claimShow

Soooo yea, I'm VERY stumped