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Wow thank you for this because I was stuck as well. Crappy interface, I wish this was emphasized in their documentation a little bit more (https://www.cisco.com/c/en/us/support/docs/smb/routers/cisco-rv-series-small-business-routers/smb5879-openvpn-o...
Yup, same issue here with an CBW 150AX. Used the maximum password for the account and the WiFi and was informed that I was unable to save when submitting the form at the end.