paymentsAppConfigure registered but does not appear

We are developing an embedded payment app, and the installation proceeds without any issues. However, upon completion of the installation, we are not encountering the activation screen.
The app’s backend calls the paymentAppConfigure mutation as shown below:

https://shopify.dev/docs/api/payments-apps/2024-01/mutations/paymentsAppConfigure

{
"externalHandle": "app name",
"ready": true
}

The response we receive is as follows:

{"data":{"paymentsAppConfigure":{"paymentsAppConfiguration":{"externalHandle":"my payment app","ready":true},"userErrors":[]}},"extensions":{"cost" :{"requestedQueryCost":10,"actualQueryCost":1,"throttleStatus":{"maximumAvailable":546000.0,"currentlyAvailable":545999,"restoreRate":27300.0}}}}

Additionally, the URL redirect generated at the end of the installation is as follows:

https://admin.shopify.com/store/assas-demo2/apps/d55419f7d0350dffc4cd4ea5a55084/

Despite receiving no errors and confirming the publication of the app extension’s version/build in the partner dashboard, the activation screen fails to appear. It is not visible in the Settings > Payments section. We have thoroughly verified the version/build of the app extension to ensure its accuracy.
Also this error and showing in the browser console:

Error: App not found
Os https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/assets/AdminRouterProvider-8603f66a.js:23
Ry https://cdn.shopify.com/shopifycloud/web/assets/v1/vite/client/en/assets/AdminRouterProvider-8603f66a.js:23

Can you doublecheck that the externalHandle used in the paymentAppConfigure mutation matches the handle used in your app setup in the Shopify Partner Dashboard, and verify that the app is correctly set as a payments app in the Partner Dashboard?