After a power cut, I’m now being asked for my serial number?

[Mtmilan]

Hi I’ve had a power cut which has deleted all my cameras from view I’m now being asked for serial number but don’t have it.

Any clues on how to find this please

 

[Phil]

This seems unusual.
How / where are you being asked for your serial number please?

 

[Mtmilan]

When trying to add the device as they have gone completely