Support intro
Sorry to hear you’re facing problems. 
The community help forum (help.nextcloud.com) is for home and non-enterprise users. Support is provided by other community members on a best effort / “as available” basis. All of those responding are volunteering their time to help you.
If you’re using Nextcloud in a business/critical setting, paid and SLA-based support services can be accessed via portal.nextcloud.com where Nextcloud engineers can help ensure your business keeps running smoothly.
Getting help
In order to help you as efficiently (and quickly!) as possible, please fill in as much of the below requested information as you can.
Before clicking submit: Please check if your query is already addressed via the following resources:
- Official documentation (searchable and regularly updated)
- How to topics and FAQs
- Forum search
(Utilizing these existing resources is typically faster. It also helps reduce the load on our generous volunteers while elevating the signal to noise ratio of the forums otherwise arising from the same queries being posted repeatedly).
The Basics
- Nextcloud Server version (e.g., 29.x.x):
32.0.0
- Operating system and version (e.g., Ubuntu 24.04):
Ubuntu
- PHP version (e.g, 8.3):
8.3
- Is this the first time you’ve seen this error? (Yes / No):
yes
- When did this problem seem to first start?
Creating a mail account
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
no
Summary of the issue you are facing:
Creating an MS 365 Account fails due closed pop-up
Steps to replicate it (hint: details matter!):
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Register my NextCloud-Instance and create an app secret.
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Start to create a Mail Account with login-name and passowrd
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Error appears:

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Clicking “Sign Up with Microsoft”.
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Login Pop-Up shows up to enter username and password
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Nextcloud Mail App shows the following message:
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Popup still was opened. I tried to follow the steps provided but my mail account is not created.
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I tried to execute these steps with my private Hotmail-Account and it worked. Popup was not marked as “closed”.
Logs:
no logs available