That link works fine for me:
https://support.ledger.com/hc/en-us/articles/115005165269-What-to-do-if-my-Ledger-Nano-S-is-not-recognized-on-Windows-and-or-Linux-When you are attempting to use Electrum, make sure that you do not already have Ledger Live (or any other Ledger related apps open). Otherwise you might get conflicts... as only one app can communicate with the device at a time.
Try shutting down Ledger live, disconnect the device, start Electrum, and then reconnect the device and see if that works.