I don't think you have checked this thoroughly.
If a user first visits your customer application (main website) then visits your custom admin URL, it will fail and they will be redirected to the homepage itself. (I have not checked this myself, but I think this would happen)
We have a service worker, that will create hurdles for this redirect as the new URL is not blacklisted to be served by the service worker.
To solve this:
You will need to place the path myadminurl in the service-worker.js blacklist array.
https://docs.foodomaa.com/advanced-usage/using-the-full-source-code#step-4-editing-the-service-worker-file