How to link devices and synch with 1Password??

[Rrs26]

I understand I can have only 3 linked devices. I unlinked my laptop, so now have my two iPads linked. How do I link a third device, my iPhone?  The main reason is that I want 1Password and Dropbox to synch my passwords. 
my phone says that one password is no longer authorized to connect to your dropbox account tab authorized to reconnect to dropbox. When I tap authorize I go to the sign in page of dropbox on my phone but I’m told my login information is incorrect. But the login info works on the iPads so I don’t understand what is incorrect. I tap “single logon” and I am told that single sign-on is not enabled. There is no indication of how to enable it. This is all exceedingly difficult and frustrating. 
  I also don’t know how to know when and where there might be a response to my query. 
thank you 

[Walter]

Hey @Rrs26, thanks for using Dropbox and happy Monday!

Could you please send us a screenshot of the error you get so that we can have a look too?

Also, have you ensured that you're running the most up to date versions of our mobile app, your device's OS and the 1Password app too?

While at it, you may want to have a look at this Help Center article for more information about the Dropbox Passwords feature. 

Keep me posted anyhow!