When the sender is Challenge required and LinkedIn sent a verification code, enter it on that sender and select Submit code. Do not add a second sender for the same LinkedIn account.
Submit the code on this sender
The code belongs to the connect already in progress. A new sender starts a new login and does not help.
Open the same sender that shows Challenge required.
Find Verification code on the LinkedIn tab.
Enter the code LinkedIn sent to that account.
Select Submit code.
Wait for the panel to move toward Active.
Stay signed in to ReachyReach while it checks the code. The panel says the login is supervised and you should not need to retype your password. If LinkedIn still needs an extra check after the code, stay on this sender and select Mark complete. The code is short-lived, so submit it on the first sender that asked for it.
If you added a second sender
Delete or ignore the extra sender. Go back to the original Challenge required row and submit there. Two senders for one LinkedIn login waste seats and split the challenge.
If status never leaves Challenge required, confirm the code is fresh and that you are Owner or admin. Members cannot submit a verification code. Do not paste the code into a second sender.