According to ssllabs.com, the HTTP Strict Transport Security is calculate by getting the response header of the domain. If a domain redirects to another page ssllabs.com follows redirects and get the response header from the last redirected page.
My question is, Both eu-crm.zoho.com and eu-mail.zoho.com are redirected to eu.zoho.com but the HSTS value calculated is different and it affects the grade. What is the reason behind this?. How ssllabs.com calculates HSTS?. Am I missing something?. Please help me with this