There is nothing to see here in a browser, and this address on its own will not work as a connector.
A working connector URL includes a path with your own access key:
https://mcp.northcitysolutions.com/c/YOUR-UNIQUE-KEY/mcp
If you pasted only https://mcp.northcitysolutions.com into Claude, that is why it
asked you to sign in and then failed to register. Remove the connector, then add it again using the
complete link you were sent, including everything after the last slash.
If you are stuck, send a screenshot of the error, not your link. The link is the credential. Northcity Solutions.