I've had the same equilvalent domains set up for a couple of years. They have worked until the last couple of weeks. Now, the passwords only work for the host it is saved for.
Specifically, on our compary domain "company.com" I have different passwords for 3 different groups of subdomains.
First group:
Password saved for: xyz.company.com
Equivalent domains: xyz.company.com, a-b-c.company.com
Autofill not working for: a-b-c.company.com
Second Group:
Password saved for: login.system.d-e-f.company.com
Equivalent domains: login.system.d-e-f.company.com, login.system.ijk.company.com
Autofill not working for: login.system.ijk.company.com
Third Group:
Password saved for: qrs.company.com
Was there an update recently? Any help would be appreciated! Thank you!