Change Office 365 password when AD sync is enabled?

I am planning on creating an Office 365 instance sync'd with my on premise AD environment. I recall from a previous project that when 365 is sync'd with on premise then 365 users cannot reset their password through 365. They must reset it on AD first which then sync's to 365... without getting into write back and ADFS etc can any one tell me if this is correct or not?
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Sid_FAsked:
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Todd NelsonSystems EngineerCommented:
You could set the passwords to never expire and set up MFA for everyone.  That could be a viable option for you.

The following section is also something else to consider from the link to the article I provided earlier (https://docs.microsoft.com/en-us/azure/active-directory/connect/active-directory-aadconnectsync-implement-password-synchronization#how-password-synchronization-works).  I'm fairly certain the second sentence will be of particular interest to you.

Password expiration policy
If a user is in the scope of password synchronization, the cloud account password is set to Never Expire.

You can continue to sign in to your cloud services by using a synchronized password that is expired in your on-premises environment. Your cloud password is updated the next time you change the password in the on-premises environment.

Please read the full article as it may provide some education to you on this topic you are concerned about.
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
IF you don't want to use writeback, you need to reset it on on-premise AD first.
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PowerEdgeTechIT ConsultantCommented:
Everything must be done from AD - password, aliases, hide from address book, name, etc.
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timgreen7077Exchange EngineerCommented:
That is correct. If the user is an on-prem user, the user password must be reset with AD on-prem and not in O365.
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Sid_FAuthor Commented:
If I do want write back I then have to pay for azure premium! I'm wondering if there are any cheaper password reset alternatives that communicate with AD. Seems so odd that ms would make such a fundamental element a premium service
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timgreen7077Exchange EngineerCommented:
I don't know of a different alternative. I don't suggest write back anyway. All on-prem AD to be the source for all your on-prem users.  It keeps down the confusion and make it son much easier. by default it sync every 30 minutes. you can also manually for a sync or change the 30 minute window but I have found 30 minutes is sufficient.
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Todd NelsonSystems EngineerCommented:
Actually timgreen7077, AD object changes are synced every 30 minutes on schedule by default.  However, password changes are synced within 2 minutes of them being changed.

References...

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timgreen7077Exchange EngineerCommented:
Good catch Todd. thanks
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Sid_FAuthor Commented:
Ok but my understanding is if I have an on premise policy that expires passwords every 60 days then for compliance this also applies to both OWA and 365 users. The problem is 365 users can't actually change their password once AD sync is setup. This would mean a call to the helpdesk while the OWA users can reset theirs through the OWA interface
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timgreen7077Exchange EngineerCommented:
What users are you calling OWA and 365, are all the users sync via adconnect? if the user object is on-prem and being synced to o365 the password will need to be reset on Orem whether the help desk does it or the user logs into on-prem OWA or does it through their windows desktop.

if the user is created solely in o365 then the user can reset in 365 or even OWA in 365.
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Sid_FAuthor Commented:
All users are sync'ed via adconnect but only some are in 365. this means if you are on premise user you can change your password either on prem or via OWA but if you are 365 user and are not joined to the domain then you will have no option to reset your password in 365. You can only reset your password in 365 if you are completely cloud managed. As soon as you sync with AAD you need Azure premium to reset in the cloud.
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timgreen7077Exchange EngineerCommented:
if you are not joined to your on-prem domain then you will reset the password in 365.
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Sid_FAuthor Commented:
Thank You!
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