Unable to access email on mobile phone

I can't get into my emails on my mobile phone but when I use an old phone, I can. I've deleted cookies etc and restarted my phone.

I get the following message 

Oops - you can't do that right now

We couldn't sign you in just now. Don't worry - it's just a quick pause to help keep your account safe.

Try this 

Use a device you've signed in on before 

Try again from somewhere familiar 

If you're on a VPN, switch it off and have another go 

Still stuck? If this keeps happening, get in touch with us and we'll help sort it out 

Has anyone else got the same problem? It's a bit of a joke saying I'm not using a device I've used before because I can only get into emails by using a device I don't usually use. Is it a scam?