Lumen shows Unknown named parameter $searchEndPoint error when upgrading to php8 - php

Question

We are running Lumen (7.2.2) (Laravel Components ^7.0) and recently upgraded to php 8 on Elastic Beanstalk.
The same codebase works correctly on php 7.4 but since upgrading we get this error from the lumen logs:
{main}
"}
[2023-01-25 11:07:47] local.ERROR: Unknown named parameter $searchEndPoint {"exception":"[object] (Error(code: 0): Unknown named parameter $searchEndPoint at /var/app/current/vendor/illuminate/container/BoundMethod.php:37)
[stacktrace]
#0 /var/app/current/vendor/illuminate/container/BoundMethod.php(37): call_user_func_array(Array, Array)
#1 /var/app/current/vendor/illuminate/container/Util.php(37): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#2 /var/app/current/vendor/illuminate/container/BoundMethod.php(95): Illuminate\\Container\\Util::unwrapIfClosure(Object(Closure))
#3 /var/app/current/vendor/illuminate/container/BoundMethod.php(39): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Laravel\\Lumen\\Application), Array, Object(Closure))
#4 /var/app/current/vendor/illuminate/container/Container.php(596): Illuminate\\Container\\BoundMethod::call(Object(Laravel\\Lumen\\Application), Array, Array, NULL)
#5 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(386): Illuminate\\Container\\Container->call(Array, Array)
#6 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(352): Laravel\\Lumen\\Application->callControllerCallable(Array, Array)
#7 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(326): Laravel\\Lumen\\Application->callLumenController(Object(App\\Http\\Controllers\\ServicesController), 'initMicroServic...', Array)
#8 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(279): Laravel\\Lumen\\Application->callControllerAction(Array)
#9 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(259): Laravel\\Lumen\\Application->callActionOnArrayBasedRoute(Array)
#10 [internal function]: Laravel\\Lumen\\Application->Laravel\\Lumen\\Concerns\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#11 /var/app/current/vendor/laravel/lumen-framework/src/Routing/Pipeline.php(48): call_user_func(Object(Closure), Object(Laravel\\Lumen\\Http\\Request))
#12 /var/app/current/app/Http/Middleware/Authenticate.php(42): Laravel\\Lumen\\Routing\\Pipeline->Laravel\\Lumen\\Routing\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#13 /var/app/current/vendor/illuminate/pipeline/Pipeline.php(167): App\\Http\\Middleware\\Authenticate->handle(Object(Laravel\\Lumen\\Http\\Request), Object(Closure))
#14 [internal function]: Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#15 /var/app/current/vendor/laravel/lumen-framework/src/Routing/Pipeline.php(30): call_user_func(Object(Closure), Object(Laravel\\Lumen\\Http\\Request))
#16 /var/app/current/vendor/illuminate/pipeline/Pipeline.php(103): Laravel\\Lumen\\Routing\\Pipeline->Laravel\\Lumen\\Routing\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#17 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(423): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#18 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(260): Laravel\\Lumen\\Application->sendThroughPipeline(Array, Object(Closure))
#19 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(234): Laravel\\Lumen\\Application->handleFoundRoute(Array)
#20 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(170): Laravel\\Lumen\\Application->handleDispatcherResponse(Array)
#21 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(426): Laravel\\Lumen\\Application->Laravel\\Lumen\\Concerns\\{closure}(Object(Laravel\\Lumen\\Http\\Request))
#22 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(172): Laravel\\Lumen\\Application->sendThroughPipeline(Array, Object(Closure))
#23 /var/app/current/vendor/laravel/lumen-framework/src/Concerns/RoutesRequests.php(109): Laravel\\Lumen\\Application->dispatch(NULL)
#24 /var/app/current/public/index.php(28): Laravel\\Lumen\\Application->run()
#25 {main}
"} ```
Web page error:
array(4) { [0]=> int(1063678) [1]=> string(36) "5a44454-2004-499d-adff-4148694" [2]=> string(5) "35.41" [3]=> int(1) } array(1) { [0]=> string(202) "Server error: `POST http://testserver-1.elasticbeanstalk.com/api/decisions/searches_data` resulted in a `500 Internal Server Error` response: { "message": "Server Error" } " }
Because it shows a 500 error the devs regard this as a server issue but the Lumen logs suggest otherwise ?
Any suggestions on fixing this, I strongly believe it is related to the php 8 upgrade.