Why do I get the message "Agent line address number may not be empty" when I try to switch to Ready in TeamDesk?

The error message

Agent line address number may not be empty!

is caused by an incorrect configuration sequence of TeamDesk. The AnyDevice line must be created before assigning a user to a TeamDesk. To fix the problem, proceed as follows:

• Remove user from all TeamDesks
• Remove the AnyDevice line via the wizard (select the user in the location > AnyDevice and softphone configuration)
• Re-create the AnyDevice line via the wizard (select the user in the location > AnyDevice and Softphone configuration)
• Add the user to the TeamDesk group

Hint:

If the button to log in to TeamDesk is missing, check that the user has also been reassigned within the client (right-click on the hotline in the client > Show hotline details > Members tab).