It allows you to securely activate a PSA Support Account which will then give us access to your PSA partition for a specified amount of time during an active support case.

To enable this feature:

Login to your PSA tenant, navigate to Admin > My Company > Company Settings > Support User > Activate (activate for 5 days)

This user account will be activated for a set amount of time. Once activated an email will be sent out to the support with an encrypted link that will auto-login.
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​In case the support team doesn't receive an email, please navigate to PSA > Admin > Logs > Outbound Email > open the activation log
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And copy-paste the entire information highlighted in the screenshot to the support email.