Is this a custom domain? or a Railway generated domain? either way, what's stopping you from simply using the domain again?

This is a domain generated by Railway

Yes, what is stopping you from using it? are you getting some kind of error when renaming your domain to the old generated domain?

I deleted the linked service which had deployment problems to create a new one. But the domain remained in use

Yes, what is stopping you from using it? are you getting some kind of error when renaming your domain to the old generated domain?

Not Available

What domain is not available?

web-production-2f6d.up.railway.app

Do you mind sharing why you need that domain specifically?

I use it for production mobile app on stores

Please, is it possible to recover it or not?

We will have to wait for a team member to respond, in the mean time you should still work on adding a custom domain to the service and pushing an update to your app to use that new custom domain.

Please, is it possible to recover it or not?

@ulrichkouameI've replied in the private threads you've created recently. In short, the domain is attached to an active service. You'll need to change the domain associated with that service, or delete it from that service, in order to free it up.