verify your twitter account on your profile on CoSo
open twitter and CoSo in the same browser in separate tabs
open your twitter & CoSo edit profiles and remove any your twitter URL if it's there and remove any URL on your twitter account then save both profiles refresh twitter tab then on CoSo leave the edit profile page and refresh the tab
cont....
now open both edit profiles, do twitter first, and enter your CoSo URL
https://counter.social.com/@{username}
you need to enter that in the website option in edit profile save and refresh then enter your twitter url in CoSo save and leave the edit profile and refresh page
if this fails you'll have to remove both URL's again save profiles and then clear cookies and cache from both twitter and CoSo then repeat the steps above
if like me you have CoSo or twitter set to run as a PWA, progressive web app, via a browser you'll need to open both sites inside the actual browser not via the PWA
i'd recommend only doing on a PC/laptop i have only tried it via that method
this is what you should see here on CoSo for your twitter URL