is the same as your current admin password? If I change the admin password and forget to also change it manually, users will get an error message when they change their password.
That is an IMAP error message. Are you able to receive emails with your Group-Office email account? It is likely that you have to update your Group-Office email account's IMAP login password.
I have wirtten a Script which update the Userpassword and the IMAP-Password from the Users if they change her password, because it doesn't work before. If I change my password now also only numbers I get this message but he change the IMAP PAssword corretly. I can use this password for login because i have wirtten this script which change the imap an userpassword.