@feditips Correct procedure for Wordpress.com:
1. From dashboard, Tools → Marketing → Connections (in menu on the page)
2. Click the Connect button next to Mastodon.
3. In the new window that opens:
a. Sign in to your Mastodon account.
b. Approve the connection to WordPress.com by selecting Authorize.
4. After returning to WordPress.com, another pop-up window will confirm the account you want to connect to. Select Connect.
The instructions you offer don't work.