Intriguing. The user is mapped to a login, right?

What about if you restore it without keeping replication? Restore it under another name if you don't want to overwrite the other one.

As I said before, how are you creating the logins and the users?

Ok, cool 🙂 . You don't need to pause log-shipping, you just need to get your network/systems guys to make sure they change the settings in Veeam (or whatever they're...

Two lines down in the screenshot you have a line that says 'Could not find a log backup file that could be applied to secondary database'. Have a look at...

Try the restore again?

No, that's not normal. How are you doing it? (Through the GUI or by using create login [domain\user] from Windows ?)

(dup.)

... alternatively, have you got a scheduled maintenance plan (that takes a log backup) running at around that time each day?

Have you got some kind of VM backup job running every day at around that time?

First things first, you need a backslash there, not a forward-slash, e.g. Domain\username, not Domain/username

Secondly, have you actually granted that account permission to log in? It doesn't happen automatically. Log...

First things first, you need a backslash there, not a forward-slash, e.g. Domain\username, not Domain/username

Secondly, have you actually granted that account permission to log in? It doesn't happen automatically. Log...

(Dup.)

Before you made it a sysadmin, was the login you were using for database mail a member of the DatabaseMailUserRole database role in msdb? Do this then remove it from...

What happens when you start it manually?