If you are not able to login in to your PMSSS portal and it is showing a captcha error then try login using a laptop there is sometimes an issue when we are trying to login using mobile or tablet. Also, take care that the captcha used by pmsss is case-sensitive and should be written exactly the same. If this does not work try closing and reopening the website again and if this also doesn't work then you can try clearing your cache and browsing history from settings and try again.
