DROPBOX: (400) invalid_grant

Hi,

I’m trying to set up App Access to Dropbox to backup a client’s site. I got the client to generate the API code from their Dropbox account, but when I put in I keep getting “DROPBOX: (400) invalid_grant”.

I tried it with my own Dropbox account and it worked fine – it just won’t accept the client’s code.

Any advice about what’s going wrong here?

Thanks

https://wordpress.org/plugins/backwpup/