On attempt to change the password for Plesk subscription in OBAS CP using the link
Cannot log you in to Plesk with your saved password. Click here to reset the password.
the error message occurs:
An error occurred during the Plesk operation
The following records are displayed in
hspc.log with DEBUG log level:
[2016/11/13 23:03:04] [INFO]  [HSPC::MT::Plesk::PleskGate::__send_request_to_agent] Validation of XML document against XSD Schema failed:unknown-27572db0:0: Schemas validity error : Element 'stat_ttl': '-1' is not a valid value of the union type 'statTtl'.
The issue is considred as Plesk-related.
Please contact Plesk support team for assistance.