Two of our customers are unable to log in on Zendesk from time to time. However, they have been able to log in in the past. When they try to log in now, one of them gets a notification from Zendesk that says "Forbidden. Invalid authentication token". The other customer gets a notification that says her password is incorrect, even though she's sure it's correct (since this has happened several times now). Both of them are also unable to reset their own password/account. When I do it for them, they are able to log in again for a short period of time (usually several weeks). After that, the same thing happens again. I can't seem to fix it long term, no matter how often I reset their accounts. Could you perhaps help me find the cause of this, so I can solve it?
Thanks in advance!
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