Question
I cannot log in to Email Archive. Please advise on how to resolve this issue.
Answer
There may be several possible causes. Please check whether any of the following cases apply.
The Email Archive Modern onboarding process has not been completed
If the onboarding process for migrating from the previously provided Classic version to the Modern version has not been completed, you will not be able to log in to the current Email Archive.
If you have not completed the migration or are unsure, please contact HENNGE One Technical Support and include the Address of the user you would like to designate as the first administrator.
※ From the second administrator onward, the first administrator can add Users from the administration screen.
The Domain entered during Login is incorrect
If you enter a value different from your contracted primary Domain on the Domain entry screen during Login, you will not be able to log in.
Please enter the correct primary Domain for your Email Archive subscription.
[Email Archive Modern] How to Log in to the Administration
(For Microsoft 365) A Microsoft 365 UPN has been entered as the Address used for Login
Email Archive uses OIDC authentication, and the login account must use the Address of an account belonging to the IdP (Google / Microsoft tenant).
If you use a Microsoft tenant and use a Microsoft 365 UPN for Login, you will not be able to log in.
If this applies to you, please register an Address instead of a UPN and try logging in again.
If the initial administrator was registered with a Microsoft 365 UPN and cannot log in, we will register the initial administrator Address on your behalf. Please contact Support.
(For Google Workspace) You are attempting to log in with an Address using a Domain different from the registered Domain
When using a Google tenant, the Domains that can be used for Login are the Domains registered in Email Archive under ［General Settings］－［Single Sign-On］－［ID］.
(After Login as the initial administrator is successful, the Domain of the initial administrator Address is configured.)
To log in using an account with a different Domain, configure the additional Domain in the ［Single Sign-On］ settings.
Release Information: [Email Archive Modern] 5th Week of October 2025 (Single Sign-On Configuration Feature)
※ Up to 2 (2 Domains) can be registered.
Access is denied due to Source IP restrictions
You will not be able to log in if you access the service from an unregistered Source IP that is not included in Allowed IP Addresses. Please log in from an environment with a registered Source IP, or use another user who can log in to change the access control settings.
[Email Archive Modern] How to Configure Allowed IP Addresses for Accessing the Administration
[Email Archive Modern] How to Set the Time Zone
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