Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 17.0.1
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.38
PHP version (eg, 7.1): 7.3.11
The issue you are facing: The “Grant Access” page in my browser is unresponsive when I click the button after the page is opened by my sync client.
When I try on the android sync client, I get a 404 when I try to log in
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Download, install, and set up official Nextcloud docker image
- Point Linux sync client at server and let the browser page open
- Sign in
- Click “Grant Access”
The output of your Nextcloud log in Admin > Logging:
I saw no relevant output
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE