Access old phone with FRP & unknown details

[Larry_]

I'm trying to access on old S8 I used temporarily in 2018.

I have an old Samsung Galaxy S8 which I used temporarily in 2018 with a company which desolved in 2019.

The account I set it up with no longer exists and I cannot remember the password and the email address I had does not exist now.

I did a factory reset on it, but its asking me to login with an account which was set up on the phone originally but that impossible now.

How do I fully reset the phone without that information please?

[BandOfBrothers]

Did the company supply the phone @Larry_  ?

https://www.samsung.com/uk/support/mobile-devices/i-cant-unlock-my-device/ 

[Larry_]

No, the company did not supply the phone.

The company was getting a new employee (urgent request) and needed a mobile phone.

I had a new Galaxy S8 at home, which was not being used and so I set that up for the new user temporarily (but he didn't even turn up) and the phone just got put in a drawer and forgotten about.

Anyway, now, my wife's phone is playing up and I started to set this one up for her, but I'd forgotten the details I set it up with, so I went through the manual factory reset, but I now find out I still need the details of when I set it up, which I no longer have (the details)

[Larry_]

Is there anyone (maybe from Samsung) who is able to give me instructions on how to factory reset this Galaxy S8 mobile phone without the details of when I first set it up please?